The IC DI Pistol model combines excellent ergonomics with all of the features found in our full size rifle models. including an LWRCI 10.5" cold hammer forged Ni-Corr treated heavy barrel, modular one-piece free-float standard rail and Monoforge upper receiver. Our innovative "keyless" bolt carried design, combined with an operating system that is time-tested, makes the IC DI Pistol + Brace the perfect addition to the LWRCI(TM) lineup. And, since the ambi lower receiver is compatible with the rest of our IC family, you can upgrade your Di to our flagship, piston-driven IC just by switching out the upper. - CALIBER .223 REM/5.56MM NATO - MAGAZINE (1) 30rd capacity - BARREL 10.5", 1:7" twist, Heavy, 1/2 x 28 TPI Muzzle, A2 Flash Hider - RECEIVERS Monoforge upper and ambi lower - TRIGGER Mil-Spec - BRACE SB Tactical SBA3