Duty Upper Receiver Group, 16″, 5.56 – Black

This complete upper chambered in 5.56mm features an M4 receiver with a forward assist, dust cover, M4 feed ramps, houses a Geissele Reliability Enhanced Bolt Carrier Group, and features bomb-proof installation of our Super Compact Gas Block, to ensure reliability and proper operation. The handguard is a version of our MK16 Super Modular Rail currently fielded by USASOC and renowned by operators for their performance and comfort.

The Geissele Reliability Enhanced Bolt Carrier Group is Nanoweapon coated and features a properly torqued and staked, chrome lined gas key. The Cam Pin is machined from advanced, medical steel known as H13 which is also coated with Nanoweapon for maximum corrosion and wear resistance. 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 our Stressproof bolt stronger and more fatigue resistant. The Geissele Stressproof bolt is also forged, not machined from barstock. 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. Each bolt is rigorously inspected, high pressure tested, mag particle inspected and Nanoweapon coated.