The upper is a 14.5 inch BCM middy, lower is a LMT. The problem is that on the last round the carrier engages the bolt catch/release and not the bolt. The last round is fired, empty brass will eject, BCG will be held back just not by the bolt. This happens with USGI mags, pmags, and it happens with 4 different lowers. Ammo was TAP, buffer was H2.
When I put in an old Bushmaster carrier this did not happen. If I manually cycle the action with the thunderbolt I can make it happen. When I manually cycle the action with a different carrier I can not. Will this problem go away with more trigger time? Should I try stoning an area of the carrier and if so where?
If this seems like a problem with the carrier to you guys I will contact the manufacturer, if not let me know what you think. Thanks.


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