This review covers the Brownells BRN-180 Gen 2 upper receiver, a side-folding, piston-driven AR pistol upper compatible with milspec AR lowers. It highlights the dual recoil spring system, adjustable gas block for suppressor use, and the ability to work on the gas system without full disassembly. The reviewer praises its reliability and ease of breakdown, noting its historical AR-180 roots.
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