What About the Retro Receivers?

Re “Four AR-15 Lower Receivers Assembled and Range Tested,” April 2022

Enjoyed the article on AR-15 lower receivers. In your discussion of the Brownells (Retro) BRN-601, you mentioned the BRN-180, but failed to mention the AR-18, AR-180, and AR-180B were all piston-driven, not direct impingement. Additionally, the AR-18 and 180 came with a folding stock and priority magazine. The AR-180B lower reviver and stock (non-folding) are one piece, made of a polymer material. And the magazine well was modified to accept standard AR-15 magazines. Keep up the good work. — James

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