For sale: NEW The Troy MRF is the strongest user-installed free-floating rail system in the world. Troy MRFs are available for all M16/M4 weapon systems equipped with the original factory barrel nut. The MRFs patented mounting system reinforces the barrel nut with a sturdy clamp and anti-rotation alignment lugs. Troy MRF BattleRails provide an uninterrupted rail extension and hand guard aligned perfectly with the host weapon's flat-top receiver. Machined from 6061-T6 hardened aircraft aluminum and finished in MIL-SPEC Type III hard coat with Teflon. Accepts Quick-Detach 360 Push Button Swivel. Made in the U.S.A. *Lifetime limited warranty, see Weapon Upgrade | M4 | M16 | AR15 | Firearm Accessory | Troy Industries for details. Retails for $229.00, ASKING FIRM PRICE OF $180.00. This is a great price, please no low ballers.