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Posted: 9/24/2014 2:03:08 PM EDT
Why can't I design a piston build in .300 Blackout with the Adams arms parts?

The piston blocks and pistons can be used but the bolt carriers aren't available.

Link Posted: 9/28/2014 12:58:37 AM EDT
[#1]
This puzzles me as well. Curious to know what is up.
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