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AR-15 full auto bolt vs semi-auto bolt

Discussion in 'Rifle Country' started by jwsturr, Jun 27, 2010.

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  1. jwsturr

    jwsturr Member

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    Building an ar for target shooting/hunting which bcg should I get? I know the differences between the groups, but are there advantages in having one over the other? Thanks...
     
  2. Mags

    Mags Member

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    More mass in the auto carrier, auto carriers function extremely well with a heavy buffer in a carbine gas system. I am sure someone smarter than me can explain why, but I don't know why.
     
  3. otrman

    otrman Member

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    Some feeding issues are caused by the bolt cycling too fast, not allowing the next round to seat fully flush in the mag before it is stripped off by the bolt. The additional mass in the auto carrier and the heavier buffer slow the cycling, not enough to notice without some hi-tech equipment. Talking about hundredths of a second. Also most all auto carriers are MP and HP inspected which IMO gives you a better product. Just get the BCM auto carrier and bolt and you won't have anything to worry about. At least as far as the carrier and bolt are concerned.
     
  4. Kentucky

    Kentucky Member

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    From Rob's chart...

     
  5. strambo

    strambo Member

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    When buying a separate BCG, I get an auto. If a rifle (like my LMT) comes w/ a semi BCG, I don't care as long as the firing pin is shrouded, which it is on the LMT semi carriers.
     
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