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Windham Weaponry “RP9SFS-450M”

  • Model: RP9SFS-450M

  • Caliber: .450 Bushmaster

  • Type: Pistol

  • Action: Semi-Automatic, Gas Impingement System

  • Capacity: 5 + 1 – Ships with one 5 Round Magazine

  • Safety: Manual Lever with Indicator Markings on Both Sides of Receiver

  • Receiver: Flat Top Upper Receiver / Magpul Enhanced Trigger Guard in Lower

  • Receiver Material: Forged 7075 T6 Aircraft Aluminum with Aluminum Trigger Guard

  • Receiver Finish: Hardcoat Black Anodize Finish with Laser Caliber Identification

  • Bolt Material: Carpenter 158 Steel

  • Barrel: 9” Medium Profile, Melonite QPQ Finish with .450 Compensator

  • Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel w. M4 Feed Ramps

  • Rifling: 1 Turn in 24″ – Right Hand Twist

  • Receiver Tube: 5-Position SBA3™ Stabilizing Arm Brace – incl. Q.D. Endplate and Q.D. sling swivel

  • Forend: 7″ Windham Weaponry Free-Float Railed Handguard

  • Pistol Grip: Hogue Beavertail Pistol Grip

  • Rear Sight: Magpul MBUS Rear Flip Sight

  • Front Sight: Magpul MBUS Front Flip Sight

  • Packaging: Hard Plastic Gun Case with Operators Manual


  • The Windham Weaponry .450 Thumper

    Want an exciting deer hunt in a straight-walled rifle cartridge state? Or, for that matter, any state that allows semi-auto hunting? Check out the Windham Weaponry .450 Thumper rifle! Read Article [...]

Model: RP9SFS-450M

  • Weight: 5.8 Lbs. (without magazine)
  • Length: 26.25”
  • UPC: 848037051332
RP9SFS-450M – Tech Sheet

The Windham Weaponry Lifetime Warranty.

The Details...

Lifetime Warranty

Windham Weaponry is proud to offer the highest quality rifles made anywhere. As testament to that quality, we back our rifles with a Lifetime Warranty that is also transferrable to subsequent owners.

To purchase Windham Weaponry firearms, please see your local FFL Dealer for details.