GEISSELE AUTOMATICS Super Duty MOD1 5.56 NATO 14.5in Upper Receiver Group (08-547B)

Geissele's Super Duty MOD1 Complete Upper Receiver is perfect for a custom AR build. The barrel is precision machined and cold hammer forged out of the highest quality steel, featuring a manganese phosphate coat and a chrome lining for excellent resistance to the elements. The barrel is topped with an HUXWRX Flash Hider-QD 556 suppressor-ready muzzle device. One of the Super Duty MOD1 Upper Receiver's more notable features is Geissele's own Reliability Enhanced Bolt Carrier Group. This BCG is Nanoweapon coated and features a gas key that's been properly staked, torqued, and is lined with chrome. Adding to the Reliability Enhanced Bolt Carrier Group's performance is a cam pin machined from H13 tool steel with a Nanoweapon coating for corrosion/wear resistance, and extended upper rails are included to provide greater stability and improve feeding reliability. Another feature of the Reliability Enhanced Bolt Carrier Group is its Stressproof Bolt, which is precision machined from Carpenter 158+ barstock - a material that is cleaner, has less impurities, and offers greater strength and fatigue resistance. To accommodate a wide range of optics, the Super Duty MOD1 Upper Receiver is equipped with an updated MK16 Super Modular Rail that's been perfectly mated to the upper receiver to eliminate and risk of rail rotation. The MK16 rail runs the length of the receiver and fore-grip, and provides more than enough space for iron sights, red dots, scopes, and clip-on thermal/night vision devices.