Geissele Super Duty 5.56 NATO 16" 1:7" CHF Bbl DDC Stripped Upper Receiver w/15" M-LOK MK16 SMR 08-247S is an ideal addition to any custom AR build, bringing the quality and craftsmanship Geissele products are known for. This Geissele Super Duty 16 upper pairs a 16" cold hammer forged, chrome-lined barrel with a full 15" MK16 Super Modular Rail, seamlessly attached via center-aligning tab to eliminate any chance of rail rotation. That's a real point of failure on lesser rails — a loose handguard walks a mounted optic or light off zero over time, and this mounting system is built specifically to prevent that. Manganese phosphate coating adds another layer of durability on top of the chrome lining, extending service life across high round counts. As a Geissele Stripped upper receiver, it comes without charging handle, BCG, or muzzle device, giving builders full control over which internals go into the rifle. Key Features: 16" cold hammer forged, chrome-lined barrel, 1:7 twist Manganese phosphate coating 15" MK16 Super Modular Rail, center-aligning tab mount Stripped configuration — no BCG, charging handle, or muzzle device Desert Dirt Color finish 5.56 NATO chambering Fits any mil-spec AR-15 lower receiver Rail rotation-resistant mounting system This Geissele Super Duty Upper 16 hands builders the hardest part of an upper build — a properly manufactured barrel and rail — while leaving the rest of the parts selection entirely up to them. Geissele Automatics Geissele Super Duty 5.56 NATO 16" 1:7" CHF Bbl DDC Stripped Upper Receiver w/15" M-LOK MK16 SMR 08-247S