The Geissele Super Duty AR-15 Upper Receiver Assembly features the latest in weapon technology available exclusively from Geissele Automatics. This 16” complete upper chambered in 5.56mm features a Nanoweapon coated Surefire Closed-Tine Flash Hider mounted to a 16” durable black oxide coated, CHF, Chrome Lined 1-7 twist barrel.
Included is a brand new, 15” Super Modular Rail MK16 that mates to the upper via a center aligning tab removing any chance of rail rotation. Also included is the Geissele Reliability Enhanced Bolt Carrier Group. This Nanoweapon read more coated BCG features a properly torqued and staked, chrome lined gas key. The Geissele Reliability Enhanced Bolt Carrier Group also features extended upper rails, providing greater stability and dramatically increasing feeding reliability.
The Geissele Reliability Enhanced Bolt Carrier Group comes with the Geissele Stressproof Bolt. Made from Carpenter 158+, directly developed with Carpenter Steel metallurgists to create a material that is cleaner and has less impurities. This makes Geissele’s Stress proof bolt stronger and more fatigue resistant. This allows us to optimize the grain structure of the steel to yield a bolt capable of 5 times the life of a mil-spec bolt.