This expert guide details the assembly and features of the Geissele USASOC URGI 5.56mm upper receiver group, as reviewed by former Special Forces personnel. It highlights key components like the Geissele MK16 handguard, Daniel Defense barrel, Surefire muzzle device, and Vortex optic, emphasizing the advantages of the M-LOK system and mid-length gas system for modern combat applications.
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