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Uppers

Uppers

All upper receivers not chambered in 5.56x45 or .223 Remington come with one (1) caliber specific magazine. Capacity may vary depending on your State's laws.

When ordering an upper reciever unit please keep the following in mind: All complete uppers sold on-line come fully assembled, headspaced and test-fired. While each upper is made to mil-spec standards for dimensions and tolerances, uppers may fit differently on various lowers. Some may fit tighter than other, some may fit looser. Some may require minor fitting based on tolerance stacking. Each upper comes with a lifetime warranty and a 60 Day Satisfaction Guaranty. Please see our Warranty page for details.



Items 41 to 54 of 54 total

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  1. K10UR 10mm Upper Receiver, 16" bbl. K10UR 10mm Upper Receiver, 16" bbl.
    K10UR 10mm Upper Receiver, 16" bbl.
    k10ur

    K10UR 10mm Upper Receiver, 16" bbl.

    Complete upper receiver assembly manufactured in 10 mm caliber. Includes one 18 round polymer magazine. Standard with A2 upper receiver, but available with an optional picatinny flat-top upper (includes standard military A-frame front sight base), or Optics Ready flat-top by optioning in a picatinny gas block.

    Uppers are 100% complete and fully assembled with complete bolt-carrier assembly and forged charging handle. Ready to drop on any standard AR15 lower reciever. Simply attach the upper and swap out to the 10mm magazine, and you are ready to shoot. Swap back and forth between calibers in as little as 10 seconds!

    This caliber conversion DOES NOT require the changing of hammers, triggers, buffers or buffer springs. No need to add in a magazine well block adapter, additional ejector assembly or mag well plug either. Designed to work with any standard , unmodified AR15 lower with A2 or collapsible stocks.

    Other pistol calibers available: 9mm, 45 ACP and 40 S&W.

    Learn More
    $721.50
  2. 24" .223 WSSM Upper Conversion Unit 24" .223 WSSM Upper Conversion Unit
    24" .223 WSSM Upper Conversion Unit
    K8MAGUR223

    24" .223 WSSM Upper Conversion Unit

    Upper conversion unit for your complete AR-15 lower receiver designed for .223 Winchester Super Short Magnum. Learn More
    $895.70
  3. K45UR-FT: 45 ACP Flat-top Upper Receiver, 16" K45UR-FT: 45 ACP Flat-top Upper Receiver, 16"
    K45UR-FT: 45 ACP Flat-top Upper Receiver, 16"
    K45UR-FT

    K45UR-FT: 45 ACP Flat-top Upper Receiver, 16"

    Complete upper receiver assembly chambered in 45 ACP and includes one 18 round polymer magazine. Standard with Picatinny Falt-top upper receiver.

    Upper is 100% complete with bolt carrier assembly and charging handle. Ready to drop on any standard AR15 lower receiver. Simply attach the upper and swap out to the 45 ACP magazine, and you are ready to shoot. Swap back and forth between calibers in as little as 15 seconds!

    This caliber conversion does not require the changing of hammer, trigger, buffers or buffer spring. No need to add in a magazine well adapter or mag well plug either. Designed to work with any standard , unmodified AR15 lower with A2 or collapsible stocks.

    Other pistol calibers available: 9mm, 10mm and 40 S&W.

    Don't forget Extra magazines and/or spare pistol-cal parts.

    Learn More
  4. K9UR: 16" 9mm A2 Upper Receiver K9UR: 16" 9mm A2 Upper Receiver
    K9UR: 16" 9mm A2 Upper Receiver
    K9UR

    K9UR: 16" 9mm A2 Upper Receiver

    Complete upper receiver assembly chambered in the wildly popular and affordable 9mm pistol cartridge. Standard forged 7076T6 aluminum A2 upper with one high capacity 30 round polymer magazine. Front sight and handguard options available.

    Don't forget extra magazine and spare parts!

    Learn More
  5. K30R16UR: 16in. 7.62x39 K16 Style Upper Receiver K30R16UR: 16in. 7.62x39 K16 Style Upper Receiver
    K30R16UR: 16in. 7.62x39 K16 Style Upper Receiver
    K30R16UR

    K30R16UR: 16in. 7.62x39 K16 Style Upper Receiver

    16" Bull barreled match grade 7.62x39 target/hunting upper. Great for an Olympic Arms or any major brand lower. Learn More
    $618.80
  6. K1668UR: 16in. 6.8 Remington K16 Style Upper Receiver K1668UR: 16in. 6.8 Remington K16 Style Upper Receiver
    K1668UR: 16in. 6.8 Remington K16 Style Upper Receiver
    K1668UR

    K1668UR: 16in. 6.8 Remington K16 Style Upper Receiver

    16" Bull barreled match grade 6.8 Remington target/hunting upper. Great for an Olympic Arms or any major brand lower. Learn More
    $591.50
  7. K16-300UR: 16in. 300 Blackout K16 Style Upper Receiver K16-300UR: 16in. 300 Blackout K16 Style Upper Receiver
    K16-300UR: 16in. 300 Blackout K16 Style Upper Receiver
    K16-300UR

    K16-300UR: 16in. 300 Blackout K16 Style Upper Receiver

    16" Bull barreled match grade 300 Blackout target/hunting upper. Great for an Olympic Arms or any major brand lower. Learn More
    $591.50
  8. K24P-UR: 11.5" barreled 5.56x45 Pistol/SBR upper K24P-UR: 11.5" barreled 5.56x45 Pistol/SBR upper
  9. K24POR-UR: 5.56x45 AR15 pistol upper K24POR-UR: 5.56x45 AR15 pistol upper
    K24POR-UR: 5.56x45 AR15 pistol upper
    K24POR-UR

    K24POR-UR: 5.56x45 AR15 pistol upper

    5.56x45 caliber 11.5" AR15 pistol or SBR upper, optics ready Learn More
    $572.00
  10. K24P-40-UR: 40 S&W caliber 11.5" AR15 Pistol/SBR upper K24P-40-UR: 40 S&W caliber 11.5" AR15 Pistol/SBR upper
  11. K24P-40-UR-OR: 40 S&W caliber 11.5" AR15 Pistol/SBR upper K24P-40-UR-OR: 40 S&W caliber 11.5" AR15 Pistol/SBR upper
  12. K24P-45-UR: 45 ACP caliber 11.5" AR15 Pistol/SBR upper K24P-45-UR: 45 ACP caliber 11.5" AR15 Pistol/SBR upper
  13. K24P-45-UR-OR: 45 ACP caliber 11.5" AR15 Pistol/SBR upper K24P-45-UR-OR: 45 ACP caliber 11.5" AR15 Pistol/SBR upper
  14. GSUR: Gamestalker Upper Receiver GSUR: Gamestalker Upper Receiver

Items 41 to 54 of 54 total

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