WP360 No Nonsense Precision Mil-Spec Upper

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Status: Currently In Production

SKU: WP360‑NN-MS-16300

WP360 AR15 Assembled Upper Receiver Package – .300 ACC

Built with rugged, American-made components including a forged 7075-T6 aluminum upper, free-float 9" handguard, and a premium bolt carrier group, this package is engineered for consistent, reliable performance. The 10" stress-relieved 4150 CMV barrel with corrosion-resistant finish delivers accuracy and durability optimized for both supersonic and subsonic ammunition. The versatile .300 Blackout caliber excels in suppressed configurations while providing powerful terminal ballistics.

This complete upper receiver package comes fully assembled, range tested, and sighted in—ready to install and shoot right out of the box. Outfitted with a mil-spec flash hider and metal flip-up iron sights, it strikes the perfect balance of precision, dependability, and tactical versatility for any AR-15 build. 

Upper Receiver

• Forged from 7075‑T6 aluminum

• Precision machined to mil‑spec M16/M4 specifications

• M4 feed ramps for reliable feeding

• Type III hard-coat anodized finish

• Laser‑engraved T‑marks (light)

• Forward assist and dust cover installed

• .250 takedown pin holes for universal fit

• 100% Made in the USA

Handguard

• Free‑float design, machined from 6061‑T6 aluminum

• Length: 9" with continuous top Picatinny rail

• M‑LOK® slots at 3, 6, and 9 o’clock positions

• Anti‑rotation tabs for secure lockup (fits forged uppers; may require hand‑fit on billet)

• 6061‑T6 barrel nut, no indexing required

• Hard-coated anodized finish

• Inside diameter: 1.350"

• Weight with mounting hardware: 12.6 oz

• Compatible with low‑profile gas blocks

• 100% Made in the USA

Bolt Carrier Group (BCG)

• M16 style carrier – 8620 steel, H&M Black Nitride finish

• Bolt – 9310 steel, heat treated, shot peened, MPI/HPT tested (batch)

• Gas key – 4140 billet steel, properly seated with Grade 8 fasteners and staked for reliability

• Cam pin – 4140 steel, nitride treated for wear resistance

• Extractor – billet 4140 steel, heat treated, shot peened, phosphate coated with insert and Viton O‑ring

• Firing pin – 17‑4 H900 stainless steel, precision machined

• Final ground before plating for true fit

• Test-fired and inspected for proper function

• 100% Made in the USA

Charging Handle

• Standard AR15 mil‑spec design

• Machined from billet 6061‑T6 aluminum

• Black anodized finish

• Lightweight – 1.5 oz

• Proudly Made in the USA

Gas System

• Low profile .750 gas block – 4140 heat-treated steel, QPQ finish, set‑screw secured

• Stainless steel gas tube (pistol‑length) with coiled roll pin

• 100% Made in the USA

Barrel

• Chamber: .300 AAC Blackout

• Length: 10 inches

• Material: 4150 Chrome Moly Vanadium steel, stress relieved after rifling

• Finish: QPQ corrosion-resistant coating

• Twist Rate: 1:7 RH, optimized for supersonic and subsonic rounds

• Muzzle: 5/8"x24 threaded for muzzle devices

• Compliance: All NFA/ATF rules apply; compatible with registered SBR, MG, or pistol lowers with proper legal restrictions

Muzzle Device

• Mil-spec A2‑style Birdcage flash hider/compensator

• 4150 steel construction, black phosphate finish

• 5/8"x24 threading

• 6 slot pattern with solid bottom to reduce dust signature

• .30 caliber 

Flip-up Iron Sights

• Built from high-quality aluminum alloy for rugged, reliable performance in any environment

• Spring-loaded pop-up action deploys instantly at the push of a button for fast target acquisition

• Compatible with all rifles using Picatinny or Weaver rail systems (Winchester, Remington, Colt, and more)

• Front sight adjustable for elevation; rear sight adjustable for smooth windage control

• Low-profile, flat-folding design stays out of the way when not in use

• Lightweight and compact to minimize bulk without sacrificing performance

• Includes front sight adjustment tool for quick and easy zeroing