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Thread: Bolt Carrier Group pros I have a question?

  1. #11
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    What seemed strange on mine is the cut out is not as big as a normal SemiAuto BCG. From the pics posted showing the differance that semi auto bcg looks alot more cut out than mine? Thanks again.

  2. #12
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    Quote Originally Posted by 2_wacko View Post
    What seemed strange on mine is the cut out is not as big as a normal SemiAuto BCG. From the pics posted showing the differance that semi auto bcg looks alot more cut out than mine? Thanks again.
    There's a lot of variants out there. The Les Baer carriers are cut like yours. It looks good to me. I'd just shoot it.
    "You people have too much time on your hands." - scottryan

  3. #13
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    Quote Originally Posted by markm View Post
    There's a lot of variants out there. The Les Baer carriers are cut like yours. It looks good to me. I'd just shoot it.
    Thanks everyone for the input!

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    From the (really useful, thanks Troy!) pictures:
    IIRC, the unshrouded firing pin was to foul the hammer if there was some halfassed attempt to make a homebrew 'full auto'. The half circle carrier was, as noted, meant to not trip an autosear.
    Why the three variants of dimension on the bottom circle of the carrier has never made sense to me, but the largest one, it was argued, added mass to the carrier, which was a good thing.

    For the OP, your somewhat reduced lower circle isn't apt to hurt anything; I'd just shoot it.

    The other question was the origin of some of this stuff; whether to blame Colt management for being neurotic, or BATFE regulators, or some combination thereof, it's a good thing, at least for the moment, that we can use BCGs that haven't been neutered.
    Moon

  5. #15
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    Quote Originally Posted by halfmoonclip View Post
    IIRC, the unshrouded firing pin was to foul the hammer if there was some halfassed attempt to make a homebrew 'full auto'.
    Exactly. It works in conjunction with the "notched" hammer. The small spool firing pin hangs up on the notch should the discontector fail or be modified to not catch the hammer.

    Weight differences between standard carriers and relief cut carriers are negligible. All else equal a standard 16 carrier is preferrable. But I'd run the carrier that the OP bought without hesitation.
    "You people have too much time on your hands." - scottryan

  6. #16
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    Mark, the 'notched hammer' thing raises its ugly head again. I've a 9mm AR, and was fortunately spared the notched hammer; my bolt is ramped, but there was a bunch of miserable stuff connected with earlier AR parts. I had forgotten that the notched hammers were also used in 5.56 versions, and I'm thinking my first (and now departed) post-ban AR had the unshrouded pin.
    Do we know why manufacturers are now able to make mil-spec parts?
    Thnx,
    Moon
    Last edited by halfmoonclip; 03-18-13 at 13:47.

  7. #17
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    Quote Originally Posted by halfmoonclip View Post
    Do we know why manufacturers are now able to make mil-spec parts?
    The ramped carrier on the 5.56 is a whole different ball game than a 9mm ramped carrier.

    The notched hammer on the 5.56 was just Colt's over protective sillyness. The Type 1 hammer is the original style part, and much closer to the real M16 hammer.
    "You people have too much time on your hands." - scottryan

  8. #18
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    mark, I took a beating (maybe over on the Colt board) for suggesting that any of the redundant protection against full auto conversion was Colt's doing, tho' I'd heard they had.
    Anyway, happy to have avoided such things with rifles currently in my possession.
    Moon

  9. #19
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    Quote Originally Posted by halfmoonclip View Post
    mark, I took a beating (maybe over on the Colt board) for suggesting that any of the redundant protection against full auto conversion was Colt's doing, tho' I'd heard they had.
    Colt hit the pinnacle of that crap with their Sear Block. We just had Specialized Armament mill off one of those suckers in a 90's era lower we got.
    "You people have too much time on your hands." - scottryan

  10. #20
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    Quote Originally Posted by markm View Post
    Colt hit the pinnacle of that crap with their Sear Block. We just had Specialized Armament mill off one of those suckers in a 90's era lower we got.
    I successfully avoided those, but was cursed with the halfcircle, unshrouded firing pin BCG at one point. They were reputed to be a real stinker to remove without the right tools.
    Any notion what, other than competition, led to Colt's change of heart?
    Oh, we didn't even talk about the oversize FCG pins.
    Moon

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