If you are looking for a tactical upper system with quad rail, a 10 inch rifled barrel, AR-15 A2 Muzzle Brake, crush washer, vertical tactical grip, and a side cocking upper with a rail for your choice of optics, then this is for you! It improves the accuracy and performance and offers the rails to mount grips, laser, tactical light or anything else. Just slide in your bolt assembly, drop into your receiver, lock into place and its ready to go. Works with all MPA 9mm mid sized guns, M-11 Semi and SMG models. Does not fit MPA Mini 930 series. (gun & other components sold separately)* Addition of this item may require additional paperwork to be filed with the ATF, check with your local dealers. ***OUT OF STOCK-**NOT AVAILABLE*****