This guide details the installation of a Unity Tactical FAST ACOG Mount system, including an offset RMR, onto a SIG Sauer MCX Spear-LT rifle. The process emphasizes proper use of torque tools and thread locker for secure optic mounting, as demonstrated by a firearms instructor. Key steps involve unboxing components, preparing the RMR with a sealing plate, applying thread locker, and torquing all fasteners to specification.
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