I understand the advantages of the heavier FA BCG. However, given the installation of a lighter SA BCG; wouldn't simply adding a heavier buffer give the same advantages? It would seem so to me, but I may be missing something here.
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I understand the advantages of the heavier FA BCG. However, given the installation of a lighter SA BCG; wouldn't simply adding a heavier buffer give the same advantages? It would seem so to me, but I may be missing something here.
Last edited by dorchester; 06-21-10 at 04:07.
heavier than what?
Well, heavier than was in there before. Say FA BCG and an H buffer versus a SA BCG and an H2 buffer. The reciprocating mass is probably about the same, so what would be the functional difference, if any? (The math might not be exact but you see where I'm going with this...)
Semi-auto carriers are an obscene left over from days gone by. They should all be shipped to people in ban states or melted down for making new auto carriers. Get an auto carrier and depending on your AR an "H" buffer and call it a day.
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Can't really argue with your viewpoint. But I was wondering if you had the SA BCG a really cheap H2 buffer (or whatever makes the math work out right) would be a nice option over a really expensive FA BCG from the good folks at BCM. (These abbreviations are starting to get to me...) Assuming it would work the same, of course. Which is the original question.
Last edited by dorchester; 06-21-10 at 05:18.
All you need is a bolt carrier if you already have a bolt. They cost about 69.00. The price difference between an auto and semi is very small. About 10.00-15.00 dollars.
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Yes it would.
If using a semi auto carrier I do recommend using a slightly heavier buffer or a highly rate buffer spring, note that either may cause short stroking with weak borderline SAAMI spec .223 ammo.
If you're using a non shrouded firing pin carrier I'd suggest replacing it with a shrouded M16 or AR15 carrier especially on a hard use gun. The non shrouded ones work but by design it's the carrier which is supposed to cock the hammer not the firing pin.
On occasion I do see AR15s that will just not run 100% with a semi auto carrier. Sometimes these are a bear to diagnose as that have very intermittent short stroking etc. Changing nothing but the bolt carrier to an M16 carrier and then the gun runs. I've seen this is an assault ban era Colt (Colts Manufacturing not Colt Defense) M4 (the one with the hideous brake and fixed M4 stock.) Seen it in some frankengun builds and in an LMT. Even though CAR gas system ARs are generally overgassed the lighter the bolt carrier the more gas its takes to make them cycle correctly. This is simply because they have less rearward momentum and the lighter carrier is being defeated more easily by the buffer spring. FWIW I see this less with commercial CAR gas system guns and I believe it's because these have huge gas ports.
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Thanks, GotM4, I figured that would be the simplest/cheapest solution. But, not being a pro, I figured it couldn't hurt to ask. I am going to be very careful about overdoing anything so that the .223 and 5.56 loads both work well. The carbine is an LMT so that shouldn't be too hard.
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