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Posted: 12/1/2015 1:45:42 AM EDT
My complete rifles obviously came with BCG's. I've done some lower builds, but bought complete uppers that also came with BCG's.
Now I'm doing an AR-pistol build, and the pistol gas length upper I got on a PSA Black Friday deal does not come with a BCG. I plan on using the pistol with a SIG SBX brace, and a buffer / spring / tube that come together as a package. So, back to the BCG....are there pros and cons to getting a 'full auto' cut vs. a 'semi' cut in a semi pistol? I assume the full auto cut has more weight to it... Educate me please. |
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Buy a full auto bcg, file your firing pin, and boom, instant machinegun.
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Hope your PSA pistol upper runs for you. I was running a heavy buffer and full auto bcg and still had to go with an adjustable gas block to get it to cycle right. But once it was tuned in
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Non full auto cut carriers have less material, and some say can break easier. Most non full auto cut carriers aren't properly staked, and may not have an MPI/HPT bolt.
Just buy a quality full auto or m16 bcg and be done with it op. |
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I knew I should have gone to the tech forum ![]() View Quote View All Quotes View All Quotes Quoted:
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Buy a full auto bcg, file your firing pin, and boom, instant machinegun. I knew I should have gone to the tech forum ![]() ![]() Ok, in all seriousness I have an LMT with an M16 and SR-15 with a semi auto carrier. No issues from either. If I bought a new one, I'd just get a full auto BCM and call it a day. If I had cycling issues, I'd remedy those by tinkering with the buffer weight and spring before I got a lighter BCG. |
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I can't say for sure, but I have been told bolt weight can be a factor in recoil in a rifle. I can't remember if it lowers recoil or not though. I'd guess it "absorbs" recoil being heavier?
If that's the case, it would be better in a pistol I'd assume. along with the proper buffer. But people who know what they're talking about will be along shortly. |
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Hope your PSA pistol upper runs for you. I was running a heavy buffer and full auto bcg and still had to go with an adjustable gas block to get it to cycle right. But once it was tuned in ![]() ![]() View Quote I can't say I ever understood this part. I have several AR's with varying gas lengths/barrel lengths and never once had to 'tune' the gas. |
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![]() Ok, in all seriousness I have an LMT with an M16 and SR-15 with a semi auto carrier. No issues from either. If I bought a new one, I'd just get a full auto BCM and call it a day. If I had cycling issues, I'd remedy those by tinkering with the buffer weight and spring before I got a lighter BCG. View Quote View All Quotes View All Quotes Quoted:
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Buy a full auto bcg, file your firing pin, and boom, instant machinegun. I knew I should have gone to the tech forum ![]() ![]() Ok, in all seriousness I have an LMT with an M16 and SR-15 with a semi auto carrier. No issues from either. If I bought a new one, I'd just get a full auto BCM and call it a day. If I had cycling issues, I'd remedy those by tinkering with the buffer weight and spring before I got a lighter BCG. That's what I had figured. Thanks for the confirmation ![]() |
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I won't claim to understand it either. I just know that I tried everything I could to get the rifle to cycle, finally went with an adjustable gas block and now it works 100%
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Milspec m16 because full circle at the rear and the part that contacts the hammer.
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I bet that upper is hella over gassed.
Get the full auto carrier. |
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Why are semi auto carriers even still made?
Why were they created in the first place? I'm assuming some feel good lawyer crap. |
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Full auto BCG
Let your rounds soak in water for a few days to soften up the primers, and then you'll be rockin it on FA |
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I use full auto bolt carriers in both my pistol and SBR. Also had to use an Heavy buffer. But they both run great now
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Why are semi auto carriers even still made? Why were they created in the first place? I'm assuming some feel good lawyer crap. View Quote My ban-era AR15 had semi carrier. I assume the AWB had something to do with this? I recall after the ban, if you didn't have an M16 carrier your wife was cheating on you and there was a high likelihood that you were gay. |
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There's zero reason for the AR15 cut bolt carrier. Get the M16 model.
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Why are semi auto carriers even still made? Why were they created in the first place? I'm assuming some feel good lawyer crap. View Quote Because the ATF issued a bulletin to all FFL's back in the mid 1980's that said having ANY full auto components in an AR-15 was considered a machinegun. Around 2005 Colt wrote the ATF a letter asking if installing a Full Auto BCG constituted making a machinegun. ATF s did not specifically endorse the use of a full auto BCG, but stated if the addition of the full auto carrier did not allow the rifle to fire more than one shot per single function of the trigger it was not a machinegun under the NFA. Therefore Colt began shipping their rifles with the Full Auto profile BCG's and soon everyone else began to follow suit. |
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If any of your other ARs have a semi BCG get the M16 cut one, if it does not cycle properly just swap with an AR cut one.
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How come all the CHROME BCG's I've seen have the AR cut? Does anyone make a Chrome carrier with the M16 cut?
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The reason the cut AR15 carrier is in existence is to make the bolt carrier, hammer, and firing pin bind up if you attempted remove the connector.
The notch exposes the rear of the firing pin to the notched hammer, and if the hammer was still tripped as the bolt slid back into battery, the notch cut into the ban area bolt carrier would ride up and catch the edge of the exposed firing pin thus jamming your rifle. |
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My complete rifles obviously came with BCG's. I've done some lower builds, but bought complete uppers that also came with BCG's. Now I'm doing an AR-pistol build, and the pistol gas length upper I got on a PSA Black Friday deal does not come with a BCG. I plan on using the pistol with a SIG SBX brace, and a buffer / spring / tube that come together as a package. So, back to the BCG....are there pros and cons to getting a 'full auto' cut vs. a 'semi' cut in a semi pistol? I assume the full auto cut has more weight to it... Educate me please. View Quote The Full Auto cut BCG's seem to be more reliable to me. YMMV. |
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My ban-era AR15 had semi carrier. I assume the AWB had something to do with this? I recall after the ban, if you didn't have an M16 carrier your wife was cheating on you and there was a high likelihood that you were gay. View Quote View All Quotes View All Quotes Quoted:
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Why are semi auto carriers even still made? Why were they created in the first place? I'm assuming some feel good lawyer crap. My ban-era AR15 had semi carrier. I assume the AWB had something to do with this? I recall after the ban, if you didn't have an M16 carrier your wife was cheating on you and there was a high likelihood that you were gay. The AWB had nothing to do with the bolt carrier group. The BCG wasn't one of the 'evil features', like bayonet lugs, pistol grips, folding stocks, etc. |
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Damn! I've never seen more BS in all my life. There is zero advantages to using a auto carrier over a SA carrier in an
AR15. Anyone who believes otherwise is just plain ignorant. Luckily ignorance can be cured. The only difference between a semi and auto carrier is a very small amount is cut back more on the semi. The amount cut back is so it cannot trip an auto sear. The difference in weight is .3 grams, that's 1/100 of an ounce. Anyone who believes that 1/100 of an ounce will make any difference in the operation of the action in an AR15 is just plain stupid, for that, sadly, there is no cure. ETA: Now the old Colt half circle carriers, that's a different thing. Those were just plain stupid from conception. |
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Heres a hint, nearly every single phosphate BCG in the US, started life at Toolcraft
get M16 carriers always, how it this even a question |
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Unless your looking for reduced weight/recoil but a plain SA carrier isn't going to give you either. There are plenty of specialty carriers designed for low mass. View Quote View All Quotes View All Quotes Quoted:
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There's really no reason NOT to have an auto BCG. Right, in the context of SA vs auto, not specialty BCGs. Should have specified. |
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The only excuse for running a semi-auto BCG is if you have a Registered Lightning Link.
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Quoted:
Damn! I've never seen more BS in all my life. There is zero advantages to using a auto carrier over a SA carrier in an AR15. Anyone who believes otherwise is just plain ignorant. Luckily ignorance can be cured. The only difference between a semi and auto carrier is a very small amount is cut back more on the semi. The amount cut back is so it cannot trip an auto sear. The difference in weight is .3 grams, that's 1/100 of an ounce. Anyone who believes that 1/100 of an ounce will make any difference in the operation of the action in an AR15 is just plain stupid, for that, sadly, there is no cure. ETA: Now the old Colt half circle carriers, that's a different thing. Those were just plain stupid from conception. View Quote Add the unshrouded firing pins to your list of ignorance. Driving the hammer with the firing pin, instead of the bolt carrier, is my biggest gripe with them. m16 is m16. Plenty of ways to skin the semi cat, and god only knows what fuckery was decided upon. |
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Buy a full auto bcg, file your firing pin, and boom, instant machinegun. you could sell liberals on this Gun show loophole. Public believes it and votes. Kicker is, how many machine gun homicides in the last 4 decades? |
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What ever is on sale that is of a respected quality manufacturer.
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I won't claim to understand it either. I just know that I tried everything I could to get the rifle to cycle, finally went with an adjustable gas block and now it works 100% View Quote Bet the gas port and prior block overlapped, or block wasn't centered properly,resulting in it being under gassed. You added a new block and that solved the problem...ie the holes lined up |
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Out of curiosity, I just went through the safe and checked the BCG's in all my rifles. Having not paid specific attention before, I was surprised to see that they were all 'full auto' cut BCG's. Not having had any cycling problems with any of them...from different manufacturers...I guess I'll stick with what has been working.
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