This Adams Arms Tactical Elite PDW Gas Piston Upper Assembly is chambered in 5.56x45mm NATO. It features a melonite finished, 7.5" medium contour barrel with a 1 in 7" twist, making it capable of stabilizing medium- to heavy-weight projectiles of up to about 77 grains. Despite its short pistol length gas system, the piston chamber inside the PDW's gas block is the same size and has the same volume as Adams Arms' other gas system lengths. This means that unlike most AR-15 based systems that become notoriously unreliable once the barrel is reduced to less than 10" in length, the super short Adams Arms 7.5" PDW upper has the proper gas dwell time and bolt carrier velocity to allow it to function reliably and consistently in all conditions. Additional features include a free floating, 7" Samson STAR-4-EX Quad Rail Handguard that extends to surround the picatinny rail piston gas block on its bottom and both sides for additional rail space, M4 feed ramps, an A2 flash hider, bolt carrier group and charging handle assembly.

The upper's barrel has been finished inside and out with Adams Arms' proprietary QPQ Melonite treatment that bonds with the metal on a molecular level. Also referred to as salt bath nitriding, this treatment produces an extremely hard, slick surface on steel that resists carbon adhesion and increases corrosion resistance, extending a barrel's service life by reducing the friction produced inside the bore upon firing for a net decrease in bore surface wear over time. Nitriding converts the barrel steel's surface without any build-up, retaining all of the benefits of traditional chrome lining without suffering the accuracy degradation commonly encountered due to uneven application of chrome inside the barrel's bore. The end result is a barrel that's capable of producing accuracy on par with a match stainless steel tube, while also exhibiting the longevity and resilience of a chrome lined, mil-spec barrel.

It comes "Factory installed" with Franklin Arms Binary Trigger lower receiver. Perfect for max concealment or just a day to day "Truck gun" . Small enough to be manuverable and place inside a small bag.

Will only ship to state where binary trigger is allowed. Shipping to your local FFLL required. Call or text 6102023335 if you have any questions.

FRANKLIN ARMORY-M4-BUILT-LOWER-RECEIVER for Sale