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.