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The gas piston system of this upper half runs cooler and cleaner than direct impingement gas systems.
Action: Semi-auto gas piston
Chamber: 5.56 NATO - this rifle will also shoot .223
Twist Rate: 1/9 button rifled
Muzzle Device: A2 flash hider (Stag Arms Compensator on post ban models)
Barrel: 16", 4140 steel, chrome lined, government profile, manganese phosphate coated
Handguard: Freefloat Diamondhead VRS-T handguard
Upper Receiver: Forged and mil-spec 7075 T6 aluminum with type 3 hard coat anodizing and a picatinny rail on top
Bolt Carrier: Piston bolt carrier with a manganese phosphate coating
Charging Handle: Standard mil-spec
Front Sight: Diamondhead low profile front flip up sight
Rear Sight: Diamondhead low profile rear flip up sight
Q: What is the warranty coverage for this upper half?
A: All of our upper halves have a one year warranty.
Q: What types of rail attachments can be installed on the handguard?
A: Only Diamondhead rail sections will work with the handguard.
Q: What benefits does the plus package offer?
A: The plus package upgrades the barrel to 1/7 twist 4150 steel, and the semi auto bolt carrier to an M16 bolt carrier. The bolt and barrel are HP/MP tested.