So a few months back I purchased a few PSA Blem Lowers, all checked out to being within Milspec. Onto my question. I want to build a .300 blackout pistol. I purchased and Aero Precision complete upper. Going with a Ballistic Advantage barrel. But what buffer tube and buffer do I need for the .300 black out to cycle properly. The barrel is an 8.3" with gas block. So just need a direction to get started.
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