This review of the Brownells BRN 180 upper receiver highlights its modernization attempt of the AR-18 action, adapting it for AR-15 lowers. While offering a reliable operating system and shooting flat, the reviewer identifies significant drawbacks. These include a high price point for an upper receiver, potential for increased flash and noise, and a critical design flaw where a section of the bolt carrier guide rail is detachable via a screw, which can loosen over time, compromising the system's integrity. The reviewer strongly advises against considering it for serious self-defense applications, labeling it a 'continuous almost' due to these persistent issues.
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