This product spotlight from Brownells introduces the BRN-4 upper receiver kit, a fully HK416 compatible option designed to fit standard AR-15 lower receivers. The kit features a short-stroke piston system, an HK-style anti-rotation handguard, and a newly designed bolt to prevent bolt tilt. It offers a more accessible entry into HK416-style performance at a fraction of the cost of a genuine HK416 upper.
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