Includes all internal parts, ready to install you choice of buttstock. Accepts all types of AR15 and M16 stocks, MIL SPEC or commercial. Action- Semi-automatic Type- Lower Calibers- 223 Rem, 50 Beowulf, 6.5 Grendel, 7.62x39, 50 BMG, etc. Finish/Color- Black Grip- Black Not legal in CA
