Duty Upper Receiver Group, 10.3", 5.56 - Black

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Duty Upper Receiver Group, 10.3", 5.56 - Black

The Geissele Duty Complete Upper Receiver Group is a high quality, mil-spec upper that is completely assembled in-house at our facility in North Wales, Pennsylvania. Geissele aims to bring a highly dependable, quality manufactured and assembled upper at a price point for cost conscious shooters who demand optimal performance and reliability.  Under the Duty line this is offered at a price that is accessible for Police Departments and the individual officer, as well as anyone looking for a Duty grade upper to depend on.


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. This Nanoweapon coated BCG 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.

Duty Upper Receiver Group, 10.3", 5.56 - Black Specification

UPPER  Mil-Spec Upper Receiver, M4 Feed Ramps, 7075-T6
MUZZLE DEVICE   Mil-Spec A2 Flash Hider
BARREL   10.3" CMV Steel, 1-7 twist, chrome lined, HP/MPI tested, Button Rifled
BARREL PROFILE   Government Profile
GAS SYSTEM   Carbine Length
HANDGUARD   9.3" Geissele MK16 Rail, Black
BOLT CARRIER GROUP   Nanoweapon Reliability Enhanced BCG


Duty Upper Receiver Group, 10.3", 5.56 - Black Notes

Please refer to our FAQ for information regarding purchase of this item.


NFA DISCLAIMER/WARNING: This item does not meet the 16" minimum barrel length requirement, and requires registration and a tax stamp with the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE) when assembled into a complete rifle.  Additional state and local restrictions may apply. It is the sole responsibility of the buyer to comply with any and all applicable laws.


ANODIZE & FINISH DISCLAIMER: Please refer to the "Anodize Shade Variations and Finish Methods" notice prior to purchase of this product.

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