User Panel
Posted: 7/11/2024 4:34:59 PM EDT
I purchased an LMT EBCG a while back, after about 1000rds I noticed my gas rings were completely worn out. When replacing them I looked in the gas ring run and saw that there were spiral "grooves" in it which were definitely what wore down the rings so bad. I sent photos to LMT and they took it in, and sent me a replacement. However, this new bolt carrier has a bigger problem- bolts don't fit in it very well. My E-Bolt doesn't fit at all. Another bolt I have has to be really forced to fit. I've sent another email to LMT but at this point I just wanna get this squared away and get rid of the thing, LMT QC seems to be in the tank from my perspective- if the replacement to a bad part is also bad then clearly they aren't earning their premium prices.
Just posting to warn others about QC issues with this LMT product. |
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[Last Edit: d16man]
[#1]
@Muricha
This is a tech area and not GD. See my incoming PM. |
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-History will remember Snark as the language of ignorance.
-All the fiction novels I once loved I now fear. FJB Our tax $$$ payed for a Pandemic and I didn’t even get swag. |
[Last Edit: NewWind]
[#2]
Originally Posted By Muricha: You’re a dog faced pony soldier. See how easy it is to make accusations on public forums? View Quote Ok do you want me to post the pictures and emails from myself and LMT? What would be the best way to prove my new ebcg is faulty? Video of me being unable to insert a bolt? What convinces you that I am lying? |
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[#3]
We'd love to see pics. Ignore him, he forgot this is Tech.
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[#4]
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[#5]
Pics: https://imgur.com/a/INQ7g9g
Dunno how to embed them off hand so this will do for now. I'll figure out how to demonstrate the current issue with the bore being too tight after work. |
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[#6]
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[#7]
Originally Posted By raverill: go/nogo gauges would be best to check bore specs. Someone on here way smarter than me can provide the nominal dim and tolerance View Quote I don't have go/no go gauges, would showing that bolts that fit comfortably in other carriers do not fit in this one be enough for most people? |
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[#8]
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[#9]
Originally Posted By NewWind: Would showing that bolts that fit comfortably in other carriers do not fit in this one be enough for most people? View Quote Be enough? Enough for what? What are you hoping to accomplish? It doesn't really matter if anyone here believes you or not. This is a public forum, no one can give you a new eBCG. |
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[#10]
Can you film a video in your phone of how tight the fit is in the EBCG and another carrier and upload it to YouTube and post link here?
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[#11]
Originally Posted By ClangClang: Be enough? Enough for what? What are you hoping to accomplish? It doesn't really matter if anyone here believes you or not. This is a public forum, no one can give you a new eBCG. View Quote View All Quotes View All Quotes Originally Posted By ClangClang: Originally Posted By NewWind: Would showing that bolts that fit comfortably in other carriers do not fit in this one be enough for most people? Be enough? Enough for what? What are you hoping to accomplish? It doesn't really matter if anyone here believes you or not. This is a public forum, no one can give you a new eBCG. This. |
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[#12]
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[#13]
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[#14]
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[#15]
Originally Posted By backbencher: https://i.imgur.com/cT30HYK.png https://i.imgur.com/mduFGP8.png https://i.imgur.com/UutRKcV.jpeg https://i.imgur.com/ZIyO6pS.png View Quote Damn! That's borked. |
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Can't never could 'til try came along.
"All welchers should be removed from the EE".-Aimless R.I.P. to the EE |
[#16]
Yeah, that ain’t right. Send it back to them, let them see it first hand
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[#17]
Looks almost like some kind of roller burnishing failure. That surface is not gonna make a nice gas seal nor be kind to the gas rings.
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[#18]
The machining marks that you circled red is not a defect. It is one of the features of LMT enhanced bolt carriers.
Quote from the LMT's website: "Relief grooves added to the top and bottom to channel debris and maintain fluid movement" These groves will not wear down bolt's gas rings. Gas rings travel deeper in the channel during operation, and never touch these grooves. Check the specs on LMT's website: https://lmtdefense.com/product/full-auto-enhanced-5-56-bolt-carrier/ |
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[#19]
Originally Posted By s4s4u: The bore? What has the bore to do with it? View Quote View All Quotes View All Quotes The bore inside the carrier. Originally Posted By ClangClang: Be enough? Enough for what? What are you hoping to accomplish? It doesn't really matter if anyone here believes you or not. This is a public forum, no one can give you a new eBCG. It does I want to accomplish the goal of warning others about a quality issue like I had clearly stated in the title of this thread, however you apparently thought that reading comprehension should take a back seat to trying to make someone look like a fool on the internet. If I thought anyone here would give me a new BCG I'd not have had it replaced by LMT in the first place. But whatever, being snarky is good too. Originally Posted By raverill: Yeah, that ain’t right. Send it back to them, let them see it first hand I did send it back, the one they returned to me didn't have the machining marks but now none of my bolts fit (including the e-bolt from them that I have). It's very frustrating. Originally Posted By Richard257: The machining marks that you circled red is not a defect. It is one of the features of LMT enhanced bolt carriers. Quote from the LMT's website: "Relief grooves added to the top and bottom to channel debris and maintain fluid movement" These groves will not wear down bolt's gas rings. Gas rings travel deeper in the channel during operation, and never touch these grooves. Check the specs on LMT's website: https://lmtdefense.com/product/full-auto-enhanced-5-56-bolt-carrier/ The one that LMT sent back is different/does not have those grooves. |
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[Last Edit: NewWind]
[#20]
Originally Posted By raverill: Can you film a video in your phone of how tight the fit is in the EBCG and another carrier and upload it to YouTube and post link here? View Quote Hey, just took a video. Gonna get it uploaded but for now what it shows is three bolts, one is the E-Bolt from LMT (does not fit at all), a mil spec bolt from microbest (has to be forced in) and my very first bolt ever from PSA which has to be forced in but not quite as hard. Both the ones that fit feel pretty tight in the new eBCG, especially compared to how they feel on their native carriers. Of course I'd have liked to use the E-Bolt in the eBCG but it seems like that'll be impossible until I win the QC lottery with LMT. Gonna go make a YouTube account so upload may be tomorrow morning. Edit: Here is the video. Noticed after I uploaded that I said "dirty, used" about a bolt that looked pretty clean, as I had cleaned it in an effort to see if that might be enough to ease any fitment issues- bothersome to misspeak like that but overall irrelevant to what I'm showing. |
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[Last Edit: TGWLDR]
[#21]
Originally Posted By Richard257: The machining marks that you circled red is not a defect. It is one of the features of LMT enhanced bolt carriers. Quote from the LMT's website: "Relief grooves added to the top and bottom to channel debris and maintain fluid movement" These groves will not wear down bolt's gas rings. Gas rings travel deeper in the channel during operation, and never touch these grooves. Check the specs on LMT's website: https://lmtdefense.com/product/full-auto-enhanced-5-56-bolt-carrier/ View Quote View All Quotes View All Quotes Originally Posted By Richard257: The machining marks that you circled red is not a defect. It is one of the features of LMT enhanced bolt carriers. Quote from the LMT's website: "Relief grooves added to the top and bottom to channel debris and maintain fluid movement" These groves will not wear down bolt's gas rings. Gas rings travel deeper in the channel during operation, and never touch these grooves. Check the specs on LMT's website: https://lmtdefense.com/product/full-auto-enhanced-5-56-bolt-carrier/ Sand/dirt relief grooves were added to the top and bottom of the front portion of the bolt carrier. Attached File Originally Posted By NewWind: >the one they returned to me didn't have the machining marks but now none of my bolts fit (including the e-bolt from them that I have). It's very frustrating. The one that LMT sent back is different/does not have those grooves. |
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Can't never could 'til try came along.
"All welchers should be removed from the EE".-Aimless R.I.P. to the EE |
[Last Edit: JoshNC]
[#22]
I’d send it back to LMT. With the disclaimer that I have an older enhanced carrier in a Colt m4a1, I think the LMT enhanced carrier is a solution in search of a problem for the contemporary AR15.
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[#23]
Originally Posted By JoshNC: I’d send it back to LMT. With the disclaimer that I have an older enhanced carrier in a Colt m4a1, I think the LMT enhanced carrier is a solution in search of a problem for the contemporary AR15. View Quote Frankly I just wanted it to experiment with. I think the only thing that's pretty cool is having a way to increase unlocking time for pressures to decrease, but how much of an actual difference that makes on a modern AR really is dubious I think. |
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[#24]
Originally Posted By NewWind: Hey, just took a video. Gonna get it uploaded but for now what it shows is three bolts, one is the E-Bolt from LMT (does not fit at all), a mil spec bolt from microbest (has to be forced in) and my very first bolt ever from PSA which has to be forced in but not quite as hard. Both the ones that fit feel pretty tight in the new eBCG, especially compared to how they feel on their native carriers. Of course I'd have liked to use the E-Bolt in the eBCG but it seems like that'll be impossible until I win the QC lottery with LMT. Gonna go make a YouTube account so upload may be tomorrow morning. Edit: Here is the video. Noticed after I uploaded that I said "dirty, used" about a bolt that looked pretty clean, as I had cleaned it in an effort to see if that might be enough to ease any fitment issues- bothersome to misspeak like that but overall irrelevant to what I'm showing. View Quote View All Quotes View All Quotes Originally Posted By NewWind: Originally Posted By raverill: Can you film a video in your phone of how tight the fit is in the EBCG and another carrier and upload it to YouTube and post link here? Hey, just took a video. Gonna get it uploaded but for now what it shows is three bolts, one is the E-Bolt from LMT (does not fit at all), a mil spec bolt from microbest (has to be forced in) and my very first bolt ever from PSA which has to be forced in but not quite as hard. Both the ones that fit feel pretty tight in the new eBCG, especially compared to how they feel on their native carriers. Of course I'd have liked to use the E-Bolt in the eBCG but it seems like that'll be impossible until I win the QC lottery with LMT. Gonna go make a YouTube account so upload may be tomorrow morning. Edit: Here is the video. Noticed after I uploaded that I said "dirty, used" about a bolt that looked pretty clean, as I had cleaned it in an effort to see if that might be enough to ease any fitment issues- bothersome to misspeak like that but overall irrelevant to what I'm showing. lmt ebcg issue |
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[Last Edit: j3_]
[#25]
Originally Posted By TGWLDR: Sand/dirt relief grooves were added to the top and bottom of the front portion of the bolt carrier. https://www.ar15.com/media/mediaFiles/416992/Screenshot_20240712_041934_Samsung_Inter-3264138.JPG View Quote Thanks for the post and search skills. I looked for something to post that it was talking about the rails but could not find the info. Just mentioning that the gas rings went to or past the ports and area with the odd machining marks in the side didn't seem enough. |
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[#26]
That carrier is definitely out of spec. Doesn’t even appear to have any chrome in the bore. Hopefully LMT takes care of you.
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[#27]
Originally Posted By NewWind: Frankly I just wanted it to experiment with. I think the only thing that's pretty cool is having a way to increase unlocking time for pressures to decrease, but how much of an actual difference that makes on a modern AR really is dubious I think. View Quote Did you end up sending it back? I just bought an enhanced carrier with the same issue. It's my second LMT enhanced carrier, and I was able to swap the bolts between them to get it to work. After seeing your post, I'm thinking about contacting LMT about it. |
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[#28]
Originally Posted By Nerdish: Did you end up sending it back? I just bought an enhanced carrier with the same issue. It's my second LMT enhanced carrier, and I was able to swap the bolts between them to get it to work. After seeing your post, I'm thinking about contacting LMT about it. View Quote I was actually gonna make a.post today, they did indeed make it right. The newest one fit the bolt and I gave it and the upper it was in to my dad. Third time's the charm, I guess. Because they didn't ask me to send the undersized one back, I was able to continue examining it, and I found what looks like it could be causing the problem but it's subtle enough visually that I don't think I could capture it with my dogshit phone camera, it looks like about 2/3rds of an inch into the bore of the carrier the finish gets rough, and when using a toothpick over the area it does feel more rough. It might be a while before I can get a photo, but I do have a buddy who has a good camera so he and I will just have to make sure and get my BCG and his camera in the same room sometime soon |
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[#29]
Originally Posted By NewWind: I was actually gonna make a.post today, they did indeed make it right. The newest one fit the bolt and I gave it and the upper it was in to my dad. Third time's the charm, I guess. Because they didn't ask me to send the undersized one back, I was able to continue examining it, and I found what looks like it could be causing the problem but it's subtle enough visually that I don't think I could capture it with my dogshit phone camera, it looks like about 2/3rds of an inch into the bore of the carrier the finish gets rough, and when using a toothpick over the area it does feel more rough. It might be a while before I can get a photo, but I do have a buddy who has a good camera so he and I will just have to make sure and get my BCG and his camera in the same room sometime soon View Quote Awesome - thanks! |
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