The Brownells BRN-180 Gen 3 upper receiver offers significant reliability and quality-of-life improvements over previous generations. Key enhancements include a retainer for the recoil assembly, a full-length steel shield in the upper receiver for adverse conditions or suppressed use, and a toolless gas system. The charging handle has been moved to the left side, which the reviewer finds intuitive, and the barrel features an enhanced shoulder for suppressor mounting.
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