WP360 No Nonsense Precision Mil-Spec Upper
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Status: Currently In Production
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.
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
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
Weight with mounting hardware: 12.6 oz
Compatible with low‑profile gas blocks
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
Standard AR15 mil‑spec design
Machined from billet 6061‑T6 aluminum
Low profile .750 gas block – 4140 heat-treated steel, QPQ finish, set‑screw secured
Stainless steel gas tube (pistol‑length) with coiled roll pin
Chamber: .300 AAC Blackout
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
Mil-spec A2‑style Birdcage flash hider/compensator
4150 steel construction, black phosphate finish
6 slot pattern with solid bottom to reduce dust signature
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