M4 Tactical Piston Carbine

The M4 Carbine, with short-stroke piston operation, is cleaner running and more reliable than a standard M4 Carbine.
It features many upgrades, like Samson free-float quad-rail handguards and Magpul CTR buttstock. Available with 14.5-inch or 16-inch barrels, 1:7 Twist and Chrome Lined.