WSM15 Billet Upper Receiver

WSM15 Billet Upper Receiver

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Warrior Systems Upper Receivers are precision machined from billet aluminum stock for a fit and finish that is second to none.  Our receivers have been carefully designed to achieve optimum balance, and added strength and rigidity exceeding standard mil-spec.  Our tight machining tolerances ensure match grade performance perfectly fit for a precision build.  M4 feed ramps are machined into the upper to ensure more reliable cartridge feeding (when paired with a barrel with m4 feed ramps in the extension).  Our receivers are designed to be compatible with most mil-spec receivers on the market. 

All Warrior Systems receivers are designed and machined with pride in the USA. 


  • CNC Machined from solid billet aluminum stock
  • Engineered in-house using state of the art tools for optimum balance and strength
  • Precision machined with tighter tolerances than mil-spec for a superior fit and finish
  • Features m4 feed ramps for more reliable cartridge feeding
  • Standard finish options include Type III hard coat anodizing and Cerakote in a variety of colors
  • Exceeds mil-spec requirements
  • Compatible with virtually all mil-spec parts and accessories
  • 100% designed and machined in house at our US facility

Weight: 6.74 oz.
Length: 7.6 in.
Width: 2.0 in.
Height: 2.3 in.

The Warrior Systems Manufacturing Inc Limited Lifetime Warranty covers against defects in materials and workmanship. Warrior Systems Manufacturing Inc.® will replace or repair defective products upon inspection by our technical staff. Defects or damage from abnormal use, improper storage, unauthorized modifications, unauthorized repair, abuse, alteration, or improper installation will void the product warranty and eligibility. For more information on our warranty and returns, visit our warranty page.