• Troy's Enhanced Drop-In Rail is a non-mobile direct replacement for all plastic M4 / M16 hand guards that use rifle length and mid length rifle gas systems. • Easy to install; no gunsmithing needed. • Includes 12, 3, 6 and 9 MIL-STD Picatinny rails and four built-in sockets for Q.D. joints. • Machined from hardened aircraft aluminum with stainless steel components and finished in MIL-SPEC hardcoat anodizing.
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