Home CMMG Difference between SEMI Auto and Full Auto Bolt Carrier Groups – BCG

Difference between SEMI Auto and Full Auto Bolt Carrier Groups – BCG

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Quick explanation showing the difference between the full auto & semi BCG.

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20 COMMENTS

  1. So I'm doing my very first AR build.
    For my semi-auto AR is it ok to order an upper with a full auto bcg with a semi-auto lower assembly?
    From the looks of the video I can go ahead and get the full auto profile bcg and it will fit nicely in to my semi-auto with no complications and a nice fit.

  2. I know if you buy a legal Lightning Link you have to use the semi version BCG because a full auto BCG would trip the sear too soon and cause it to fire out of battery.You need the semi-version because the Lighting Link needs to trip the sear when the round is completely chambered and locked.

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