The Sanders Armory AR15 BILLET AMBI Side Charge Upper Receiver - 6MM ARC is a custom receiver made from 7075 T6 Grade Billet Aluminum with Mil-A-8625 Type III Hard Coat Anodized Finish and M4 Feed Ramps. This side-charge upper receiver will fit and accept any AR15 Mil-Spec lower receiver and barrel. The Bolt Carrier Group (BCG) is a dedicated custom AMBI Side Charge AR15 Mil-Spec Nitride Bolt Carrier that permits a charging knob to be inserted on either the left or right side for ease of use.  The bolt carrier includes a Mil-Spec AR15 6MM ARC bolt head (.136). The Bolt is “true” Mil-Spec dimension, and external surfaces are CNC ground after heat treatment for a precision fit and made with case Hardened 9310 Steel with Phosphate per MIL-STD-171, Hardened 4340 cam pin, Mil-Spec firing pin made of 8740 steel, center-less ground and Hard Chrome coated, the Side-Charge Handles are fortified and made of 4140 Chrome Moly with a Nitride Finish. Made in the USA!

The Sanders Armory 20" 6MM ARC Straight Fluted 416R Stainless Steel Barrel with 1:8 Twist Rate with Rifle-Length Gas system. The Performance Series air gauge tested with for long-distance shooting with a below 1 MOA. We use M4 Barrel extensions with a manufacturer's Limited Lifetime warranty against manufacturers' defects. It uses a .750 Gas Block with a Rifle Length Gas tube.

Expect nothing less than professional grade 6MM ARC barrels from Sanders Armory.

• Sanders Armory is all about making life easy for you ... Take the frustration out of attaching your gas tube and gas block with our ALREADY Assembled Rifle Length Gas Tube and a Low Profile .750 Steel Gas Block with a Polished Phosphate finish..750” diameter barrels

KAK Industry Barrel Thread Protector is for any rifle barrel threaded with the 5/8X24 thread pitch. The KAK thread protector offers the customer a solution to several possibilities. Guard’s threads from damage and gives the muzzle a finished look when compensator or flash hider isn't installed. Some customers are awaiting a custom or special muzzle device, compensator, or a suppressor. As with many muzzle devices they can increase the muzzle noise and flash by directing the expelled gases sideways or backwards. Which can also be unpleasant if your at a range next to another shooter.