Available for In-Store Pick Up One new in box Primary Weapon System MK116 Pro chambered in .223 Wylde a chamber designed to fire both .223 Remignton and 5.56mm NATO through with a 16.1 inch 1:8&rdquo twist barrel. This rifle has Radian Raptor charging handle, PWS 15" MLok handguard, BCM pistol grip, BCM collapsible stock and one 30 round magazine, factory paperwork and factory cardboard box. This rifle operates on a mid-length piston style guide rod system.