FightLite Mission Configurable Rifle AR-15 5.56x45mm NATO 12.5inch MIL-Spec Upper Receiver Picatinny Rail 1-7 Twist 1/2x28 FightLite RIP Brake. The MIL-Spec MCR 5.56 DFR takes our standard MCR technology to a whole new level and includes all of the accessory items that are included in our standard MCR government product along with Dry Film Lubrication on critical high-friction surfaces for extra performance in extreme conditions. Once installed the patented MCR upper receiver system can be user-configured in seconds without tools to adapt to virtually any mission profile. Specifically designed for responsible armed citizens law enforcement and professional security personnel who wish to upgrade their rifle or carbine to MCR performance and capability; standard features include gas-piston operation for extreme reliability in adverse conditions; a 12.5" quick-change (3 seconds) barrel system and a MIL-STD 1913 co-planar hand-guard with rail-interface system for the mounting of optics and modern accessories. Spanning the capability range from the optic ready carbine through a lightweight support rifle; the MCR accepts standard box type AR15/M16 magazines or M27 linked ammunition at operator discretion permitting unprecedented firepower and weapon flexibility. Specifications for FightLite Mission Configurable Rifle AR-15 5.56x45mm NATO 12.5inch MIL-Spec Upper Receiver: Manufacturer: FightLite Caliber: 5.56x45mm NATO Barrel Length: 12.5 in Barrel Twist Rate: 1-7 Threads per Inch: 1/2x28 Muzzle Device: FightLite RIP Brake Compensator Finish: Anodized Color: Black Fabric/Material: 7075-T6 Aluminum Gun Rail: Picatinny Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 Additional Features: Picatinny Rail Bolt Carrier Group Included: MIL-SPEC Charging Handle Included: MIL-SPEC Features of FightLite Mission Configurable Rifle AR-15 5.56x45mm NATO 12.5inch MIL-Spec Upper Receiver Drop-On (MIL-Spec) Upper Receiver Assembly that upgrades your AR15/M16/M4 type lower receivers or rifles Package Contents: FightLite Mission Configurable Rifle AR-15 5.56x45mm NATO 12.5inch MIL-Spec Upper Receiver What firearm models does the manufacturer say FightLite Mission Configurable Rifle AR-15 5.56x45mm NATO 12.5inch MIL-Spec Upper Receiver is compatible with? The manufacturer says that FightLite Mission Configurable Rifle AR-15 5.56x45mm NATO 12.5inch MIL-Spec Upper Receiver is compatible with AR-15FightLite MCR-556-DFRS: Mission Configurable Rifle AR-15 5.56x45mm NATO 12.5inch MIL-Spec Upper Receiver Picatinny Rail 1-7 Twist 1/2x28 FightLite RIP Brake Compensator Anodized Black