The NEW Brownells BRN-4 Upper, an HK416 For The MassesBrownells just announced a new HK416-pattern upper receiver kit, the BRN-4. This piston-driven upper is compatible with standard AR-15 lower receiver groups. Brownells @ TFB: TFB Review: Brownells BRN-10 – A Legend Resurrected Brownells Exclusive: Sons Of Liberty Gun Works M4-EXO3 Rifle Build Kit NEW Brownells MPO 1-6×24 Scope with Illuminated Donut Reticle [IWA 2022] […]

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