The Troy designed MRF/DI was designed to be direct replacement for all M4/M16 carbine plastic guards. No gunsmith is required as the MRF/DI installs in less
than a minute. Provides true U.S. Military Specification M1913 rails at 12-3-6 and 9 o'clock. All MRF rail systems are constructed from hardened aircraft aluminum
and finished in MIL-STD- Type III Hard Coat Anodize Flat Black or USSOCOM Flat Dark Earth. Made in USA.