The VKTR VK-1 Complete AR-15 Upper in 5.56 NATO (brand part no. V-4027-3410-007-RP) pairs a 10.5-inch nitride-finished steel barrel with a piston-driven gas system built for reliable short-barrel performance. VKTR machines the upper receiver from billet aluminum and pairs it with a 9.85-inch quad rail handguard, giving builders a rigid, mounting-ready platform straight out of the box. A Radian Raptor charging handle and an adjustable gas system round out a package aimed at AR-15 owners who want piston reliability without building one from parts. Every VK-1 upper is made in the USA and ships ready to drop onto a compatible AR-15 lower.

Key Specifications

• Chambered in .223 Remington/5.56 NATO, the standard AR-15 defensive and range caliber.
• Fitted with a 10.5-inch barrel for a compact, maneuverable upper.
• Cut with a 1:7 twist rate to stabilize heavier 5.56 projectiles.
• Barrel is machined from steel for durability under sustained fire.
• Finished in nitride for corrosion resistance and a hard, low-friction bore surface.
• Runs a gas-piston operating system instead of direct impingement, keeping fouling out of the receiver.
• Upper receiver is billet aluminum for a tight, rigid fit.
• Wears a 9.85-inch quad rail handguard for mounting lights, optics, and accessories.
• Includes a Radian Raptor charging handle for ambidextrous, snag-free charging.
• Topped with an A2 flash hider to control muzzle flash.

Frequently Asked Questions

What gas system does this upper use? A gas-piston operating system, paired with an adjustable gas block for tuning cycling to different ammunition.

What barrel length and twist does it have? A 10.5-inch, 1:7 twist steel barrel finished in nitride.

What charging handle comes on this upper? A Radian Raptor ambidextrous charging handle.

Buy the VKTR VK-1 Complete AR-15 Upper

Built by VKTR for shooters who want piston reliability without a full custom build, this upper drops onto any mil-spec AR-15 lower. Browse our AR15 uppers selection and order yours from our Lubbock, Texas gun shop for fast, insured shipping.