James BSeries Posted November 1, 2021 Report Share Posted November 1, 2021 I am new to AR building , So I ask this stupid question. Will any 308 Bolt Carrier cycle in a Armalite Ar10 -B upper. I know about the difference of the Bolt an Barrel Extension. Must match and the head spacing, an not to mix the Bolt carriers an Bolts parts. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted November 1, 2021 Report Share Posted November 1, 2021 I posted in the other one that you started. Quote Link to comment Share on other sites More sharing options...
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