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JG15 5.56 NATO Complete Upper Assembly – 10.5″




Caliber: 5.56 NATO
Series: JG15
Barrel Length: 10.5″
Gas Seat: 0.750″
Gas Placement: Carbine-Length
Gas Block: Low profile JG Gas block
Twist Rate: 1:7
Barrel Material: CMV Alloy
Barrel Profile: Government
Barrel Finish: QPQ Nitride
M4 Feed Ramps: Yes
Muzzle Thread Pattern: 1/2-28
Muzzle Device: JG 3-Stage Muzzle Brake
Upper Receiver Finish: Class III Type 2 Hard Coat Anodize
Charging Handle: JG Ambidextrous Charging Handle
Handguard: JG 10” M-LOK Handguard
Bolt Carrier Group: JG 5.56 NATO/.223 Rem/300 Blk Nitride BCG
Dust Cover: UTG Plastic Dust Cover


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The Jacob Grey 10.5″ 5.56 NATO Complete Upper Receiver is built around the JG Billet Aluminum Upper Receiver. The JG Billet Aluminum Upper Receiver does not have a forward assist due to the exacting tolerances and reliability. These uppers have a carbine-length gas system that is combined with a low-profile gas block. The JG 10” handguard features two picatinny rail sections along the top allowing for a front sight. The shortened picatinny sections reduce weight due to less material than standard full-length picatinny rails.


All 5.56 NATO JG Barrels are made from 4150 Chrome Moly Vanadium (CMV) barrel blanks. The increased strength, hardness, and high-temperature stability of CMV barrels are better suited for full-auto and rapid fire. Our complete uppers come with a JG 10” M-LOK handguard giving you plenty of space for all the accessories you could want. The JG 3-Stage Muzzle Brake helps mitigate the recoil impulse and felt recoil.


Complete uppers with barrels under 16″ in length are only for use on AR-15 pistol lowers. Otherwise, the firearm must be registered as a Short-Barreled Rifle (SBR), or have a muzzle device permanently attached to the barrel totaling 16″ barrel length.


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