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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 1 to 20 of 57 total

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  1. 16" M4 Tactical Carbine Upper Receiver 16" M4 Tactical Carbine Upper Receiver
    16" M4 Tactical Carbine Upper Receiver
    K3B-M4-A3-TC-UR

    16" M4 Tactical Carbine Upper Receiver

    Sometimes called the "alphabet gun". The A3-TC variant takes the K3B-M4 and adds a detachable carry handle and FIRSH quad rail free floating handguard. Available in 5.56 NATO Learn More
    $796.90
  2. K45UR: 45 ACP Upper Receiver, 16" K45UR: 45 ACP Upper Receiver, 16"
    K45UR: 45 ACP Upper Receiver, 16"
    K45-UR

    K45UR: 45 ACP Upper Receiver, 16"

    Complete upper receiver assembly manufactured for 45 ACP and includes one 18 round polymer magazine. Standard with A2 upper receiver, but available with an optional picatinny flat-top upper.

    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.

    Learn More
  3. K40UR: 16in. 40 S&W Upper Receiver Conversion Unit K40UR: 16in. 40 S&W Upper Receiver Conversion Unit
    K40UR: 16in. 40 S&W Upper Receiver Conversion Unit
    K40-UR

    K40UR: 16in. 40 S&W Upper Receiver Conversion Unit

    Complete upper receiver assembly manufactured for 40 S&W and includes one 20 round polymer magazine. Learn More
    $721.50
  4. 16in. LT M4 Upper Receiver 16in. LT M4 Upper Receiver
    16in. LT M4 Upper Receiver
    LTM4UR

    16in. LT M4 Upper Receiver

    The LT model has a M4 style barrel. Other options are also included standard. Available in 5.56 NATO Learn More
    $696.80
  5. 16in. LTF Upper Receiver 16in. LTF Upper Receiver
    16in. LTF Upper Receiver
    LTF UR

    16in. LTF Upper Receiver

    The LTF model has fluting along the full length of the barrel increasing heat dissipation. Other options are also included standard. Available in 5.56 NATO Learn More
    $743.60
  6. K16UR: 16in. K16 Upper Receiver K16UR: 16in. K16 Upper Receiver
    K16UR: 16in. K16 Upper Receiver
    K16UR

    K16UR: 16in. K16 Upper Receiver

    16" Bull barreled match grade 5.56x45 target/hunting upper. Great for an Olympic Arms or any major brand lower. Learn More
    $533.00
  7. K8MAGUR300: 24" .300 OSSM Upper Receiver K8MAGUR300: 24" .300 OSSM Upper Receiver
    K8MAGUR300: 24" .300 OSSM Upper Receiver
    K8MAGUR300

    K8MAGUR300: 24" .300 OSSM Upper Receiver

    Upper conversion unit for your complete AR-15 lower receiver designed for the Winchester Super Short Magnum and Olympic Super Short Magnum Learn More
    $895.70
  8. 16in. K74 Upper Receiver 16in. K74 Upper Receiver
    16in. K74 Upper Receiver
    K74UR

    16in. K74 Upper Receiver

    16in. carbine in 5.45x39mm Learn More
    $608.40
  9. K9UR-FT: 16" 9mm Flat-top Upper Receiver K9UR-FT: 16" 9mm Flat-top Upper Receiver
    K9UR-FT: 16" 9mm Flat-top Upper Receiver
    K9UR-FT

    K9UR-FT: 16" 9mm Flat-top Upper Receiver

    Complete upper receiver assembly chambered in the wildly popular and affordable 9mm pistol cartridge. Standard forged 7076T6 aluminum Picatinny flat-top upper with one high capacity 30 round polymer magazine. Front sight and handguard options available. Learn More
  10. 16" K3B-M4 Upper Receiver 16" K3B-M4 Upper Receiver
    16" K3B-M4 Upper Receiver
    K3B-M4UR

    16" K3B-M4 Upper Receiver

    Features an M4 contoured barrel and M4 handguards. Available in 5.56 NATO Learn More
    $588.90
  11. 16" K3B Upper Receiver 16" K3B Upper Receiver
    16" K3B Upper Receiver
    K3BUR

    16" K3B Upper Receiver

    K3BUR: 16" heavy bbl upper Learn More
    $526.50
  12. K68UR: 16" 6.8 SPC Upper Receiver K68UR: 16" 6.8 SPC Upper Receiver
    K68UR: 16" 6.8 SPC Upper Receiver
    K68UR

    K68UR: 16" 6.8 SPC Upper Receiver

    Complete upper receiver assembly manufactured for 6.8 Remington/SPC and includes one magazine. Learn More
    $637.00
  13. K8MAGUR243: 24" .243 WSSM Upper Conversion Receiver Assembly K8MAGUR243: 24" .243 WSSM Upper Conversion Receiver Assembly
    K8MAGUR243: 24" .243 WSSM Upper Conversion Receiver Assembly
    K8MAGUR243

    K8MAGUR243: 24" .243 WSSM Upper Conversion Receiver Assembly

    Upper conversion unit for your complete AR-15 lower receiver designed for .243 Winchester Super Short Magnum. Learn More
    $895.70
  14. K8MAGUR25:  24"  .25 WSSM Upper Conversion Unit" K8MAGUR25:  24"  .25 WSSM Upper Conversion Unit"
    K8MAGUR25: 24" .25 WSSM Upper Conversion Unit"
    K8MAGUR25

    K8MAGUR25: 24" .25 WSSM Upper Conversion Unit"

    Upper conversion unit for your complete AR-15 lower receiver designed for .25 Winchester Super Short Magnum. Learn More
    $895.70
  15. K8UR Targetmatch Upper in 5.56x45 caliber. 416 SS Bull bbl. K8UR Targetmatch Upper in 5.56x45 caliber. 416 SS Bull bbl.
    K8UR Targetmatch Upper Receiver
    K8UR

    K8UR Targetmatch Upper Receiver

    Top end assembly with a 20" bull Targetmatch barrel. Available in 5.56 NATO and 6.8 SPC Learn More
    $560.30
  16. K9UR-OR: 9mm Optics Ready Upper Receiver, 16" K9UR-OR: 9mm Optics Ready Upper Receiver, 16"
  17. K40UR-OR: 40 S&W Optics Ready Upper Receiver, 16" K40UR-OR: 40 S&W Optics Ready Upper Receiver, 16"
  18. K45UR-OR: 45 ACP Optics Ready Upper Receiver, 16" K45UR-OR: 45 ACP Optics Ready Upper Receiver, 16"
  19. K16-204UR: 16in. .204 Ruger®  K16 Style Upper Receiver K16-204UR: 16in. .204 Ruger®  K16 Style Upper Receiver
    K16-204UR: 16in. .204 Ruger® K16 Style Upper Receiver
    K16-204UR

    K16-204UR: 16in. .204 Ruger® K16 Style Upper Receiver

    16" Bull barreled match grade .204 Ruger® target/hunting upper. Great for an Olympic Arms or any major brand lower. Learn More
    $591.50
  20. LTFP-6.8UR; 6.8 Remington Upper LTFP-6.8UR; 6.8 Remington Upper

Items 1 to 20 of 57 total

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