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Posted: 11/23/2017 7:17:13 PM EDT
[#1]
Quote HistoryQuoted: It's the enhanced carrier, and I own one. It's just the enhanced carrier without the enhanced bolt. I run it in a LMT 14.5 Carbine Upper (not suppressed) with an H2 Buffer. It runs VERY smooth and my rifle gets WAY less dirty with it. It's amazing. The only downside is cost. I think the carrier alone is like $135-165. |
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Posted: 11/23/2017 7:21:58 PM EDT
[#2]
Quote HistoryQuoted:
I'll bite. Where? Be specific. I hope you arent talking about where I said "coating, treatment, whatever". If so you're really reaching. Those terms are in common usage loosely interchangeable. Do you work with metals? Are 9130 and 9310 ok to mix up in manufacturing? Is 6061 vs 6063 aluminum just a difference in terminology? Right again?  Quote HistoryQuoted:
Quoted: ETA: Also, you referenced Blain's post, and then in your own words called it a coating again. That isn't "a lone instance". That's twice. So, yes, "keep" was the right term for me to use. You can stop waiting now since I'm right again. Enjoy the rest of your turkey day.  I hope you arent talking about where I said "coating, treatment, whatever". If so you're really reaching. Those terms are in common usage loosely interchangeable. Do you work with metals? Are 9130 and 9310 ok to mix up in manufacturing? Is 6061 vs 6063 aluminum just a difference in terminology? Right again? Just get over yourself and move on, bud. |
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Posted: 11/23/2017 7:23:38 PM EDT
[#3]
Quote HistoryQuoted: No, that's not what I'm talking about. In the same post where you referenced Blain, you're next sentence went on to call it a coating in your own words. 
That whole post was in reference to his terminology. As to the "you're so butthurt other people people like other shit" shtick you must have missed a few posts ago when I said "Agreed! To each their own." Kinda shits on your theory, huh? |
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Posted: 11/23/2017 7:24:54 PM EDT
[#4]
Quote HistoryQuoted:
That whole post was in reference to his terminology. Quote HistoryQuoted:
Quoted: No, that's not what I'm talking about. In the same post where you referenced Blain, you're next sentence went on to call it a coating in your own words.
That whole post was in reference to his terminology. 
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Posted: 11/23/2017 7:25:56 PM EDT
[#5]
Quote HistoryQuoted:
That whole post was in reference to his terminology. As to the "you're so butthurt other people people like other shit" shtick you must have missed a few posts ago when I said "Agreed! To each their own." Kinda shits on your theory, huh? 
Remember, you're the one who got all bitchy about me posting my opinion, which I also backed up with personal experience, not the other way around. ETA: Not sure what your problem with me not caring for nitrided 9310 bolts is, when there's quite a few others in this thread who share that very same opinion? Unusual to say the least... |
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Posted: 11/23/2017 7:29:40 PM EDT
[#6]
Quote HistoryQuoted: Not after you spent the last hour being all butthurt and whiny because I said I don't like nitrided bolts. What is obnoxious is you twice said those who like them just dont shoot much yet you who apparently shoot CONSTANTLY know better than us peons. Its comical. Blain is the one who came in shitting on someones advice who was trying to help. Not me. |
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Posted: 11/23/2017 7:33:21 PM EDT
[#7]
Quote HistoryQuoted:
I dont give a shit what you like. What is obnoxious is you twice said those who like them just dont shoot much yet you who apparently shoot CONSTANTLY know better than us peons. Its comical. Blain is the one who came in shitting on someones advice who was trying to help. Not me. Quote HistoryQuoted:
Quoted: Not after you spent the last hour being all butthurt and whiny because I said I don't like nitrided bolts. What is obnoxious is you twice said those who like them just dont shoot much yet you who apparently shoot CONSTANTLY know better than us peons. Its comical. Blain is the one who came in shitting on someones advice who was trying to help. Not me. My point was that it's a known fact most of the guys who worry about how easy or hard it is to clean their bolts usually spend more time staring at their guns than shooting them. Again, don't like what I said, too bad. You seem to be the only one bothered by it. Did I strike a cord? Do you spend more time staring at your guns than shooting them??? |
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Posted: 11/23/2017 7:34:45 PM EDT
[#8]
Quote HistoryQuoted: You don't give a shit what I like, yet you keep on and on about it. My point was that it's a known fact most of the guys who worry about how easy or hard it is to clean their bolts usually spend more time staring at their guns than shooting them. Again, don't like what I said, too bad. |
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Posted: 11/23/2017 7:35:57 PM EDT
[#9]
Quote HistoryQuoted:
Got it! Phew. Thanks for setting me straight, bud. Quote HistoryQuoted:
Quoted: You don't give a shit what I like, yet you keep on and on about it. My point was that it's a known fact most of the guys who worry about how easy or hard it is to clean their bolts usually spend more time staring at their guns than shooting them. Again, don't like what I said, too bad. |
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Posted: 11/23/2017 7:39:56 PM EDT
[#10]
Quote HistoryQuoted: Christ, finally. Took long enough, bud. 
Your anecdotal experience with a single nitride bolt has awed us all, I assure you. Also, why can't you understand the difference between "you're" and "your"? It really shows your lack of knowledge, especially when you try to correct others.
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Posted: 11/23/2017 7:47:53 PM EDT
[#11]
Quote HistoryQuoted:
Your anecdotal experience with a single 9310 bolt has awed us all, I assure you. Also, why can't you understand the difference between "you're" and "your"? It really shows your lack of knowledge, especially when you try to correct others. Quote HistoryQuoted:
Quoted: Christ, finally. Took long enough, bud.
Your anecdotal experience with a single 9310 bolt has awed us all, I assure you. Also, why can't you understand the difference between "you're" and "your"? It really shows your lack of knowledge, especially when you try to correct others. I posted my experience with a bad nitrided bolt in a thread where that particular topic was being discussed and that's a bad thing, why? I know! Because you like nitrided bolts and took offense to the fact that I don't, and happened to be able to back it up with an example of why. Quit crying about it, take my experience for what it is, and move one. Have a great evening, bud! |
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Posted: 11/23/2017 7:51:29 PM EDT
[#12]
Quote HistoryQuoted: You're right. I used "you're" improperly once, so you got me there, bud! I posted my experience with a bad nitrided bolt in a thread where that particular topic was being discussed and that's a bad thing, why? I know! Because you like nitrided bolts and took offense to the fact that I don't, and happened to be able to back it up with an example of why. Quit crying about it, take my experience for what it is, and move one. Have a great evening, bud! Enjoy your bolts. I usually buy phosphate 158C, FWIW. Now on to our next great debate, how many times can a man use "bud" in a condescending fashion in a single Arf thread? Something tells me we haven't peaked yet. |
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Posted: 11/23/2017 7:55:10 PM EDT
[#13]
Quote HistoryQuoted:
Oh, lighten up, Francis. Enjoy your bolts. I usually buy phosphate 158C, FWIW. Now on to our next great debate, how many times can a man use "bud" in a condescending fashion in a single Arf thread? Something tells me we haven't peaked yet. Quote HistoryQuoted:
Quoted: You're right. I used "you're" improperly once, so you got me there, bud! I posted my experience with a bad nitrided bolt in a thread where that particular topic was being discussed and that's a bad thing, why? I know! Because you like nitrided bolts and took offense to the fact that I don't, and happened to be able to back it up with an example of why. Quit crying about it, take my experience for what it is, and move one. Have a great evening, bud! Enjoy your bolts. I usually buy phosphate 158C, FWIW. Now on to our next great debate, how many times can a man use "bud" in a condescending fashion in a single Arf thread? Something tells me we haven't peaked yet. 
I'm done with the "buds". And good choice on the phos C158 bolts. That's all I'll use anymore and they've always served me well. ETA: It is funny how being called "bud" can get under your skin so bad.
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Posted: 11/23/2017 7:57:10 PM EDT
[#14]
Quote HistoryQuoted: https://s8.postimg.org/abmwpjyed/Dz_TYCt3.jpg I'm done with the "buds". And good choice on the phos C158 bolts. That's all I'll use anymore and they've always served me well. Enjoy your holiday. Really. |
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Posted: 11/23/2017 8:00:22 PM EDT
[#15]
Quote HistoryQuoted:
Indeed, definitely my preference. Sorry the disagreements get a bit heated at times. We're all on the same team here. Enjoy your holiday. Really. Quote HistoryQuoted:
Quoted: https://s8.postimg.org/abmwpjyed/Dz_TYCt3.jpg I'm done with the "buds". And good choice on the phos C158 bolts. That's all I'll use anymore and they've always served me well. Enjoy your holiday. Really. And same to you, brother. You and yours have a happy and safe rest of the night. |
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Posted: 11/23/2017 8:02:27 PM EDT
[#16]
Quote HistoryQuoted: It's all in fun. 
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Posted: 11/23/2017 8:17:38 PM EDT
[#17]
Quote HistoryQuoted: The carrier is Toolcraft. PSA has never said who makes their bolts. It's a quality product, I've used it in several AR builds over the years and have 2 here now as back ups plus the Toolcraft BGC I linked in another post this string |
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Posted: 11/24/2017 12:06:06 AM EDT
[#18]
Never seen an issue with a Toolcraft nitrided product. These aren't the same BCG's as were having issues 4-5 years back.
Like any piece of gear you may trust your life to, you have to get out there and test it. In the unlikely event that TC's bolt supplier didn't make the product to their specs, and the heat treat got FUBAR'd you're going to find out pretty quickly. Just like ANYTHING out there, and pointing out the obvious.....if its not made properly, there will be issues. SBN, applied correctly, isn't going to harm your bolt. Either way, the best BCG available right now is right in 871JZ's avatar
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Posted: 11/24/2017 7:57:11 PM EDT
[#19]
in.
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Posted: 11/25/2017 9:21:17 PM EDT
[#20]
Quote HistoryQuoted:
Never seen an issue with a Toolcraft nitrided product. These aren't the same BCG's as were having issues 4-5 years back. Like any piece of gear you may trust your life to, you have to get out there and test it. In the unlikely event that TC's bolt supplier didn't make the product to their specs, and the heat treat got FUBAR'd you're going to find out pretty quickly. Just like ANYTHING out there, and pointing out the obvious.....if its not made properly, there will be issues. SBN, applied correctly, isn't going to harm your bolt. Either way, the best BCG available right now is right in 871JZ's avatar @871JZ |
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Posted: 11/25/2017 9:34:31 PM EDT
[#21]
Quote HistoryQuoted: Is it a KAC or LMT? Or something else? @871JZ KAC E3 |
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Posted: 11/25/2017 9:48:39 PM EDT
[#22]
IIRC, from my research a couple years ago, 9310 had the capability to be as good or maybe better than C158, but is possibly more particular with case hardening during heat treat, eg. Only buy from a reputable source.
I don't believe salt bath QPQ approaches the temperatures/time-frames necessary to alter heat treatment on these materials to the depths that they are case hardened. Other than QPQ, hard chrome is tried and true, assuming from a quality source. Ion Bond or other DLC type coatings are also worth looking at. I like QPQ since it is not a coating. |
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Posted: 11/25/2017 9:49:49 PM EDT
[#23]
Quote HistoryQuoted: @LoadedDrum KAC E3 |
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Posted: 11/25/2017 9:57:35 PM EDT
[#24]
Quote HistoryQuoted:
Thanks. Quote HistoryQuoted:
Quoted: @LoadedDrum KAC E3 |
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Posted: 11/25/2017 10:16:37 PM EDT
[#25]
Noveske Bolts are 9310................Jus saying........................I own both no problems with either.
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Posted: 11/25/2017 10:19:05 PM EDT
[#26]
Quote HistoryQuoted:
Noveske Bolts are 9310................Jus saying........................I own both no problems with either. |
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Posted: 11/26/2017 9:34:49 PM EDT
[#27]
First, Tool Craft only makes carriers. Nothing wrong with a nitrided carrier. The bolts they sell are from a very top tier manufacturer. I have purchased close to 200 from them and have yet to have a poorly machined bolt or early failure. I get 9310 parkerized. 158 and 9310 vac melt are so similar in composition, It is a toss up as to which is better. Most give a slight nod to 9310. 158 has a tiny bit more chrome, and 9310 has a small amount of molybdenum. 9310 is easier to purchase. As far as nitriding my bolts, I did stop doing it. I use S-7 for my bolts and extensions. I almost gave up on it because of the heat treat issues. The core gets brittle real easy. The standard published procedure for heat ramp up time, preheat time and solution soak time does not work for AR type bolts. There are too many dimension variations in a bolt. A mixture of thick and thin sections. Thinner sections like at the cam pin hole and the lug can over cook real easy. If it does, it is junk. So I was changing my tempering temperature to get a softer core. You also get a softer surface which is not great for wear. I nitrided for a harder surface. I was only putting chocolate on a dog turd. I had already ruined the bolt in the heat treat so the tempering did not matter. But what I had noticed was that you can get (not always) very tiny small surface fractures in the nitride layer, especially in the thinner sections. You can not see it by eye. My MP machine can pick up very tiny fractures. A crack or fracture never stops. After researching it, it can be an issue in certain dimension parts. Since then, I was lucky to have a genius tell me how to properly heat treat an S-7 bolt. It is C scale 55-56 and bullet proof. The bolts I make are for 7.62x39. They are a heavy 3 lug. I use Tool Craft for 5.56. I will put some pictures up one of these days if anyone wants to see them. Craig
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Posted: 11/26/2017 9:37:32 PM EDT
[#28]
Quote HistoryQuoted:
First, Tool Craft only makes carriers. Nothing wrong with a nitrided carrier. The bolts they sell are from a very top tier manufacturer. I have purchased close to 200 from them and have yet to have a poorly machined bolt or early failure. I get 9310 parkerized. 158 and 9310 vac melt are so similar in composition, It is a toss up as to which is better. Most give a slight nod to 9310. 158 has a tiny bit more chrome, and 9310 has a small amount of molybdenum. 9310 is easier to purchase. As far as nitriding my bolts, I did stop doing it. I use S-7 for my bolts and extensions. I almost gave up on it because of the heat treat issues. The core gets brittle real easy. The standard published procedure for heat ramp up time, preheat time and solution soak time does not work for AR type bolts. There are too many dimension variations in a bolt. A mixture of thick and thin sections. Thinner sections like at the cam pin hole and the lug can over cook real easy. If it does, it is junk. So I was changing my tempering temperature to get a softer core. You also get a softer surface which is not great for wear. I nitrided for a harder surface. I was only putting chocolate on a dog turd. I had already ruined the bolt in the heat treat so the tempering did not matter. But what I had noticed was that you can get (not always) very tiny small surface fractures in the nitride layer, especially in the thinner sections. You can not see it by eye. My MP machine can pick up very tiny fractures. A crack or fracture never stops. After researching it, it can be an issue in certain dimension parts. Since then, I was lucky to have a genius tell me how to properly heat treat an S-7 bolt. It is C scale 55-56 and bullet proof. The bolts I make are for 7.62x39. They are a heavy 3 lug. I use Tool Craft for 5.56. I will put some pictures up one of these days if anyone wants to see them. Craig |
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Posted: 11/26/2017 11:01:10 PM EDT
[#29]
Quote HistoryQuoted: Good info and I'd LOVE to see the pics. 
I'll be sure to give any objective observations on my 9310 SBN bolt regarding early wear or breakage. So far so good in a 10.5" .300blk. My others are phosphate or NiB. |
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Posted: 11/26/2017 11:07:14 PM EDT
[#30]
I've always found it interesting that TC only makes carriers. Guessing it made more sense for them to source bolts from those that already do it, and do it well, versus getting into it themselves. Though, they do such a great job on their carriers I can only assume they're capable of producing some awesome quality bolts, as well.
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Posted: 11/26/2017 11:50:53 PM EDT
[#31]
Quote HistoryQuoted:
First, Tool Craft only makes carriers. Nothing wrong with a nitrided carrier. The bolts they sell are from a very top tier manufacturer. I have purchased close to 200 from them and have yet to have a poorly machined bolt or early failure. I get 9310 parkerized. 158 and 9310 vac melt are so similar in composition, It is a toss up as to which is better. Most give a slight nod to 9310. 158 has a tiny bit more chrome, and 9310 has a small amount of molybdenum. 9310 is easier to purchase. As far as nitriding my bolts, I did stop doing it. I use S-7 for my bolts and extensions. I almost gave up on it because of the heat treat issues. The core gets brittle real easy. The standard published procedure for heat ramp up time, preheat time and solution soak time does not work for AR type bolts. There are too many dimension variations in a bolt. A mixture of thick and thin sections. Thinner sections like at the cam pin hole and the lug can over cook real easy. If it does, it is junk. So I was changing my tempering temperature to get a softer core. You also get a softer surface which is not great for wear. I nitrided for a harder surface. I was only putting chocolate on a dog turd. I had already ruined the bolt in the heat treat so the tempering did not matter. But what I had noticed was that you can get (not always) very tiny small surface fractures in the nitride layer, especially in the thinner sections. You can not see it by eye. My MP machine can pick up very tiny fractures. A crack or fracture never stops. After researching it, it can be an issue in certain dimension parts. Since then, I was lucky to have a genius tell me how to properly heat treat an S-7 bolt. It is C scale 55-56 and bullet proof. The bolts I make are for 7.62x39. They are a heavy 3 lug. I use Tool Craft for 5.56. I will put some pictures up one of these days if anyone wants to see them. Craig You never cease to amaze me, man.Top notch info. In for any pics/information that you have time to share. Anytime. |
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Posted: 11/27/2017 12:48:40 AM EDT
[#32]
DD chrome plated without a doubt.
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Posted: 11/27/2017 12:53:05 AM EDT
[#33]
Quote HistoryQuoted:
Cryptic coatings is pretty darn nice. |
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Posted: 11/27/2017 2:58:41 AM EDT
[#34]
Quote HistoryQuoted:
in.
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Posted: 11/27/2017 8:25:50 AM EDT
[#35]
Quote HistoryQuoted:
Medic, what did I miss? You are "in" every thread! |
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Posted: 11/27/2017 10:27:08 AM EDT
[#36]
Quote HistoryQuoted:
I just picked up one of these on their Black Friday deal. Got the mystic black for a 300blk build. the mystic black changed that. |
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Posted: 11/27/2017 10:46:15 AM EDT
[#37]
Quote HistoryQuoted:
I've noticed, I think it's a post count thing? |
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Posted: 11/27/2017 10:54:06 AM EDT
[#38]
Quote HistoryQuoted: i never was a fan of any of the fancy coatings, all phosphate for me. the mystic black changed that. |
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Posted: 11/27/2017 11:29:59 AM EDT
[#39]
The people here could not possibly have enough experience with the different makers to give a technically correct answer to your question. There are several brands that people have confidence in. That is really the best you can do.
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Posted: 11/27/2017 12:44:01 PM EDT
[#40]
Quote HistoryQuoted:
The people here could not possibly have enough experience with the different makers to give a technically correct answer to your question. There are several brands that people have confidence in. That is really the best you can do. 
Pretty sure all makers have been sampled. |
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Posted: 11/27/2017 7:56:27 PM EDT
[#41]
Quote HistoryQuoted:
i never was a fan of any of the fancy coatings, all phosphate for me. the mystic black changed that. Quote HistoryQuoted:
Quoted:
I just picked up one of these on their Black Friday deal. Got the mystic black for a 300blk build. the mystic black changed that. |
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Posted: 11/27/2017 8:58:22 PM EDT
[#42]
Another option up there with DD and BCM is Centurion. I have this one in a .300blk build and its been great thus far. And it matches my C4 quad rail. ;)
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Posted: 11/27/2017 9:07:09 PM EDT
[#43]
For a standard extension, the LMT enhanced bolt in a standard carrier will be the best but also by far the most expensive. My personal favorite phosphate BCG is Colt due to my own experience and the fact that Ron from BFLV said that, on average, the Colt bolts lasted the longest in his rifles and if anyone knows about the longevity of parts, it is Ron from BFLV.
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Posted: 11/28/2017 1:21:03 AM EDT
[#44]
When I was about to give up on S-7, I bought 1 foot of AERMET 100. $65.00. Not a pleasure to machine. Kind of like 17-4 stainless. Deep hole drilling a bitch. Heat treat procedure so involved and critical, it would drive you to drink. I bet the rejection rate between machining and heat treating is at least 30 percent. A test used to rate impact and crack resistance is the V notch charpy test. Aermet rates at 30 foot lbs. at O degrees, 40 at 100 degrees, and 60-68 at 400 degrees. It is somewhat temp sensitive. S-7 charpy rating more than doubles Aermet at all temps. What gets everyone screwed up on S-7 is that the basic heat treat procedure seems very easy and simple. It air quenches so there is virtually zero distortion and dimension change(.0001-.0002) and far less chance of cracking. Tempering is a piece of cake. S-7 is mostly used to make molds for injection moulding. They can weigh 500-1000 lbs. Cross sections over 2 inches thick. Std procedure works fine. Because S-7 is a higher carbon alloy, it is easier to over cook with thinner sections like in a bolt. Once you get it right, It is hard to beat. I have tried at least 7 different alloys. One favorite was 17-4 stainless.It is very tough. It will only go 45 C scale hardness. I nitrided to get a hard surface. It chipped . On paper lots of things look good. C158 and 9310 are easy to machine and so stable in heat treat, they are here to stay. The equipment to heat treat it is super expensive. Craig
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Posted: 11/28/2017 10:20:04 PM EDT
[#45]
Chrome DD or colt
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Posted: 11/29/2017 8:27:51 AM EDT
[#46]
Quote HistoryQuoted:
With a member count north of 340k, odds are that the original question can easily be answered.
Pretty sure all makers have been sampled. Quote HistoryQuoted:
Quoted:
The people here could not possibly have enough experience with the different makers to give a technically correct answer to your question. There are several brands that people have confidence in. That is really the best you can do.
Pretty sure all makers have been sampled. |
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Posted: 11/29/2017 8:46:58 AM EDT
[#47]
Quote HistoryQuoted:
And I'll bet MAYBE 2% shoot 500-1k plus rounds a month much less all year Quote HistoryQuoted:
Quoted:
Quoted:
The people here could not possibly have enough experience with the different makers to give a technically correct answer to your question. There are several brands that people have confidence in. That is really the best you can do.
Pretty sure all makers have been sampled. But yeah, I know where you are coming from. Odds are, enough have "tested" what's available though. |
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Posted: 11/29/2017 12:29:15 PM EDT
[#48]
Quote HistoryQuoted:
When I was about to give up on S-7, I bought 1 foot of AERMET 100. $65.00. Not a pleasure to machine. Kind of like 17-4 stainless. Deep hole drilling a bitch. Heat treat procedure so involved and critical, it would drive you to drink. I bet the rejection rate between machining and heat treating is at least 30 percent. A test used to rate impact and crack resistance is the V notch charpy test. Aermet rates at 30 foot lbs. at O degrees, 40 at 100 degrees, and 60-68 at 400 degrees. It is somewhat temp sensitive. S-7 charpy rating more than doubles Aermet at all temps. What gets everyone screwed up on S-7 is that the basic heat treat procedure seems very easy and simple. It air quenches so there is virtually zero distortion and dimension change(.0001-.0002) and far less chance of cracking. Tempering is a piece of cake. S-7 is mostly used to make molds for injection moulding. They can weigh 500-1000 lbs. Cross sections over 2 inches thick. Std procedure works fine. Because S-7 is a higher carbon alloy, it is easier to over cook with thinner sections like in a bolt. Once you get it right, It is hard to beat. I have tried at least 7 different alloys. One favorite was 17-4 stainless.It is very tough. It will only go 45 C scale hardness. I nitrided to get a hard surface. It chipped . On paper lots of things look good. C158 and 9310 are easy to machine and so stable in heat treat, they are here to stay. The equipment to heat treat it is super expensive. Craig |
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Posted: 11/29/2017 8:52:58 PM EDT
[#49]
Blain. I have a full service engine machining and rebuilding machine shop. 40 years in January. No rocket scientist here. Sold a couple patents back in 2000 and bought one 3 and one 4 axis machining centers. Started making my own parts. Learned by making lots of mistakes. I always liked the 7.62x39 round. Modified AR style bolts do not seem to hold up well. At 50,000 chamber pressure, 7.62x39 can generate 15-17 percent more bolt thrust than 5.56 at 60,000. And that does not take into consideration the steeper case taper on the 7.62. Opening up the bolt face on an AR bolt just makes things worse. I did not want to go with the 308 size bolt because I wanted the smaller profile and weight. Plus with a smaller bolt diameter I can bring the bullet centerline up and have a shallower feed angle. Nothing special, just my therapy from the day job. Try to post pics of the 3 lug bolt, carrier and xtension tonight. Craig
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Posted: 11/29/2017 10:48:26 PM EDT
[#50]
Quote HistoryQuoted:
Blain. I have a full service engine machining and rebuilding machine shop. 40 years in January. No rocket scientist here. Sold a couple patents back in 2000 and bought one 3 and one 4 axis machining centers. Started making my own parts. Learned by making lots of mistakes. I always liked the 7.62x39 round. Modified AR style bolts do not seem to hold up well. At 50,000 chamber pressure, 7.62x39 can generate 15-17 percent more bolt thrust than 5.56 at 60,000. And that does not take into consideration the steeper case taper on the 7.62. Opening up the bolt face on an AR bolt just makes things worse. I did not want to go with the 308 size bolt because I wanted the smaller profile and weight. Plus with a smaller bolt diameter I can bring the bullet centerline up and have a shallower feed angle. Nothing special, just my therapy from the day job. Try to post pics of the 3 lug bolt, carrier and xtension tonight. Craig |
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