This guide details the installation of the Daniel Defense RISII M4A1 FSP rail system, specifically designed for AR-15 platforms with carbine-length gas systems and a front sight base. The process involves precise torque specifications for the barrel nut (55 ft-lbs) and careful alignment of the rail, gas tube, and front sight base. The guide emphasizes the use of specific fasteners and tools, including a torque wrench and Allen wrench, for a secure and proper fit. Instruction is provided by Joe Marler, Daniel Defense's Law Enforcement Sales Manager, highlighting expert knowledge.
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