Geissele 08-246B Super Duty 5.56 NATO 14.5" 1:7" CHF Bbl Black Stripped Upper Receiver w/13.5" M-LOK MK16 SMRThe Geissele Super Duty Upper (Stripped) features the quality and workmanship you've come to expect from the Geissele name. At the heart of this stripped upper is a Super Duty upper receiver that mates to a 13.5" MK16 Super Modular rail via a center aligning tab, removing any chance of rail rotation. This family of rails is renowned by operators for their performance and comfort. It features an in-house 14.5", Manganese Phosphate coated, CHF, Chrome Lined barrel with a 1-7 twist rate. Our barrels are precision machined and cold hammer forged at our state of the art facility in North Wales, PA; utilizing the highest quality materials available. This stripped upper is ready to be furnished with your favorite components to ensure an accurate, reliable and soft recoiled shooting experience. Geissele Super Duty 5.56 NATO 14.5" 1:7" CHF Bbl Black Stripped Upper Receiver w/13.5" M-LOK MK16 SMR 08-246B