BRN-4/416 BARREL BENCH BLOCK Be ready with the right tools for the job. The Brownells BRN-4 / HK416 Barrel Bench Block was designed to provide a solid durable way to install or remove the gas block on a BRN-4 or HK416 barrel. Our bench block is specifically designed to be compatible with most gas blocks including those that have a front sight and an adjustable knob. Designed with recessed areas to conveniently hold pins and punches to help keep your parts and tools in one spot. The textured bottom helps serve as an anti-slip on most gun mats. Features Three Integrated pockets for punches Recessed pocket for roll pins Polymer Construction Overa Mfg: Brownells