M4 has the appearance and weight of a USGI M4 upper, with correct contour barrel, standard M4 handguard, A2-type flash hider, and a gas block/front sight tower with bayonet lug, sling loop, and square front sight post. Both components are built to run hard and handle the abuse of long practice sessions. Inside, the standard bolt/carrier assembly is replaced by a dedicated “bolt rail” of hardened tool steel with a blowback operated stainless steel bolt inside. The mil-spec receiver has a standard MIL-STD 1913 Picatinny rail, charging handle, forward assist (non-functioning), and ejection port cover. You practice with your existing trigger and fire control components, so the trigger pull feels the same. 22 LR magazine, and you’re ready to shoot. Replace your existing upper with the AR22, load the included Black Dog. 6.8 SPC operates well in short- and long-barrel configurations. The 6.8mm Remington Special Purpose Cartridge (6.8 SPC) delivers improved lethality over 556 NATO, and outperforms 556 NATO, 7.62x39, and 5.45x39 Soviet in most respects out to 500 yards. 22 LR AR15 FLATTOP UPPER RECEIVER lets you do live-fire training with affordable rimfire ammo while retaining the weight, balance, and feel of your rifle. Your 6.8 SPC II AR 15 Upper Receiver will arrive turn-key and ready to shoot out of the box. CMMG MK4 HT 22 AR15 UPPER RECEIVER – the CMMG MK4 HT dedicated.
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