The Geissele Super DutyA(R) 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 10.5" 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 11.5" 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.