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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.



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  1. K10UR-OR: 10mm Optics Ready Upper Receiver, 16"
    K10UR-OR: 10mm Optics Ready Upper Receiver, 16"
    k10ur-or

    K10UR-OR: 10mm Optics Ready Upper Receiver, 16"

    K10UR-OR Optics Ready Learn More
    $767.00 As low as: $747.00
  2. 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
    K24P-40-UR-OR: 40 S&W caliber 11.5" AR15 Pistol/SBR upper
    K24P-40-UR-OR

    K24P-40-UR-OR: 40 S&W caliber 11.5" AR15 Pistol/SBR upper

    40 S&W; 11.5" Optics ready AR15 pistol or SBR upper Learn More
    $767.00
  3. 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
    K24P-40-UR: 40 S&W caliber 11.5" AR15 Pistol/SBR upper
    K24P-40-UR

    K24P-40-UR: 40 S&W caliber 11.5" AR15 Pistol/SBR upper

    40 S&W; 11.5" AR15 pistol or SBR upper Learn More
    $721.50
  4. 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
  5. K24P-UR: 11.5" barreled 5.56x45 Pistol/SBR upper K24P-UR: 11.5" barreled 5.56x45 Pistol/SBR upper
    K24P-UR: 11.5" barreled 5.56x45 Pistol/SBR upper
    K24P-UR

    K24P-UR: 11.5" barreled 5.56x45 Pistol/SBR upper

    5.56x45 11.5" AR15 pistol or SBR upper Learn More
    $526.50
  6. K8UR Targetmatch Upper in 5.56x45 caliber. 416 SS Bull bbl. K8UR Targetmatch Upper in 5.56x45 caliber. 416 SS Bull bbl.
    K8-204UR: 204 Ruger Targetmatch Upper Receiver
    K8-204UR

    K8-204UR: 204 Ruger Targetmatch Upper Receiver

    Top end assembly with a 20" bull Targetmatch barrel. Chambered in .204 Ruger Learn More
    $598.00
  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. 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
  9. 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
  10. OA93UR OA93UR
    OA93UR
    OA93UR

    OA93UR

    The OA93 upper is a 6.5" barreled upper chambered in 5.56x45 only. It utilizes a 416 SS barrel with a 1x7" twist and a black-oxide finish. Learn More
    $903.50
  11. 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
    $721.50 As low as: $701.50
  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
    K24P-45-UR: 45 ACP caliber 11.5" AR15 Pistol/SBR upper
    K24P-45-UR

    K24P-45-UR: 45 ACP caliber 11.5" AR15 Pistol/SBR upper

    45 ACP 11.5" AR15 pistol or SBR upper Learn More
    $721.50
  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
    K24P-45-UR-OR: 45 ACP caliber 11.5" AR15 Pistol/SBR upper
    K24P-45-ur-or

    K24P-45-UR-OR: 45 ACP caliber 11.5" AR15 Pistol/SBR upper

    45 ACP 11.5" Optics ready AR15 pistol or SBR upper Learn More
    $767.00
  14. K9UR-OR: 9mm Optics Ready Upper Receiver, 16"
    K9UR-OR: 9mm Optics Ready Upper Receiver, 16"
    K9ur-or

    K9UR-OR: 9mm Optics Ready Upper Receiver, 16"

    K9UR-OR Optics Ready Learn More
    $767.00 As low as: $747.00
  15. K40UR-OR: 40 S&W Optics Ready Upper Receiver, 16"
    K40UR-OR: 40 S&W Optics Ready Upper Receiver, 16"
    K40UR-OR

    K40UR-OR: 40 S&W Optics Ready Upper Receiver, 16"

    K40UR-OR Optics Ready Learn More
    $767.00 As low as: $747.00
  16. K45UR-OR: 45 ACP Optics Ready Upper Receiver, 16"
    K45UR-OR: 45 ACP Optics Ready Upper Receiver, 16"
    K45UR-OR

    K45UR-OR: 45 ACP Optics Ready Upper Receiver, 16"

    K45UR-OR Optics Ready Learn More
    $767.00 As low as: $747.00
  17. 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
  18. LTFP-6.8UR; 6.8 Remington Upper LTFP-6.8UR; 6.8 Remington Upper
    LTFP-6.8UR; 6.8 Remington Upper
    LTFP-6.8UR

    LTFP-6.8UR; 6.8 Remington Upper

    LTFP 6.8 upper complete Learn More
    $769.60
  19. K40UR-FT: 16" 40 S&W Flat-top Upper Receiver K40UR-FT: 16" 40 S&W Flat-top Upper Receiver
    K40UR-FT: 16" 40 S&W Flat-top Upper Receiver
    K40UR-FT

    K40UR-FT: 16" 40 S&W Flat-top Upper Receiver

    Complete upper receiver assembly chambered in the wildly popular and affordable 40 S&W; 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
    $721.50
  20. K24P-10-UR-OR: 10mm 11.5" AR15 Pistol/SBR upper K24P-10-UR-OR: 10mm 11.5" AR15 Pistol/SBR upper
    K24P-10-UR-OR: 10mm 11.5" AR15 Pistol/SBR upper
    K24P-10-ur-or

    K24P-10-UR-OR: 10mm 11.5" AR15 Pistol/SBR upper

    10mm 11.5" Optics ready AR15 pistol or SBR upper Learn More
    $767.00
  21. K24P-10-UR: 10MM 11.5" AR15 Pistol/SBR upper K24P-10-UR: 10MM 11.5" AR15 Pistol/SBR upper
    K24P-10-UR: 10MM 11.5" AR15 Pistol/SBR upper
    K24p-10-ur

    K24P-10-UR: 10MM 11.5" AR15 Pistol/SBR upper

    10 mm 11.5" AR15 pistol or SBR upper Learn More
    $721.50
  22. K24P-9-UR-OR: 9mm 11.5" AR15 Pistol/SBR upper K24P-9-UR-OR: 9mm 11.5" AR15 Pistol/SBR upper
    K24P-9-UR-OR: 9mm 11.5" AR15 Pistol/SBR upper
    K24P-9-ur-or

    K24P-9-UR-OR: 9mm 11.5" AR15 Pistol/SBR upper

    9mm 11.5" Optics ready AR15 pistol or SBR upper Learn More
    $767.00
  23. K24P-9-UR: 9MM 11.5" AR15 Pistol/SBR upper K24P-9-UR: 9MM 11.5" AR15 Pistol/SBR upper
    K24P-9-UR: 9MM 11.5" AR15 Pistol/SBR upper
    k24p-9-ur

    K24P-9-UR: 9MM 11.5" AR15 Pistol/SBR upper

    9mm 11.5" AR15 pistol or SBR upper Learn More
    $721.50
  24. 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
    $721.50 As low as: $701.50
  25. 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
  26. 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
  27. K10UR-FT: 16" 10mm Flat-top Upper K10UR-FT: 16" 10mm Flat-top Upper
    K10UR-FT: 16" 10mm Flat-top Upper
    K10ur-FT

    K10UR-FT: 16" 10mm Flat-top Upper

    Complete upper receiver assembly chambered in the wildly popular and affordable 10mm pistol cartridge. Standard forged 7076T6 aluminum Picatinny flat-top upper with one high capacity 18 round polymer magazine. Front sight and handguard options available.

    Learn More
    $721.50
  28. GSG2 Upper Receiver GSG2 Upper Receiver
    GSG2 Upper Receiver
    GSG2UR

    GSG2 Upper Receiver

    Gamestalker Generation 2 Upper Receiver, Black Learn More
    $765.70
  29. GSUR: Gamestalker Upper Receiver GSUR: Gamestalker Upper Receiver
    GSUR: Gamestalker Upper Receiver
    GSUR

    GSUR: Gamestalker Upper Receiver

    Gamestalker Upper Receiver, Black Learn More
    $895.70
  30. 16" 7.62 x 39mm Upper Receiver 16" 7.62 x 39mm Upper Receiver
    16" 7.62 x 39mm Upper Receiver
    K30R-UR

    1 Review(s) | Add Your Review

    16" 7.62 x 39mm Upper Receiver

    Complete upper receiver assembly manufactured for 7.62 x 39mm and includes one magazine. Learn More
    $588.90

    1 Review(s) | Add Your Review

  31. K6: 20" Ultramatch Upper Receiver Assembly
    K6

    K6: 20" Ultramatch Upper Receiver Assembly

    20" Ultramatch Upper Learn More
    $783.90
  32. K868UR 6.8: 20" Targetmatch Upper, 6.8 Remington Spec-II caliber K868UR 6.8: 20" Targetmatch Upper, 6.8 Remington Spec-II caliber
    K868UR: 20" Targetmatch Upper Receiver 6.8 Remington
    K868UR

    K868UR: 20" Targetmatch Upper Receiver 6.8 Remington

    Top end assembly with a 20" bull Targetmatch barrel. Available in 5.56 NATO and 6.8 SPC Learn More
    $598.00
  33. 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
  34. 16" 6.8 SPC Upper Receiver 16" 6.8 SPC Upper Receiver
    16" 6.8 SPC Upper Receiver
    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
  35. K2CA K2CA
    K2CA: 20" Heavy Barrel Upper Receiver Unit
    K4BUR

    K2CA: 20" Heavy Barrel Upper Receiver Unit

    K2CA: Heavy Barrel 5.56x45 Complete Upper Learn More
    $572.00
  36. 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
  37. 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
  38. 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
  39. 16" K3B-FAR Upper Receiver 16" K3B-FAR Upper Receiver
    16" K3B-FAR Upper Receiver
    K3B-FAR-UR

    16" K3B-FAR Upper Receiver

    This model features a Featherweight (FAR) barrel which lightens the weight significantly without compromising accuracy or quality. Available in 5.56 NATO Learn More
    $599.00
  40. 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
  41. 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
  42. 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
    $721.50 As low as: $701.50
  43. 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

    1 Review(s) | Add Your Review

    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

    1 Review(s) | Add Your Review

  44. 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
  45. 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
  46. 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
  47. 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
  48. 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
  49. 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
    $721.50 As low as: $701.50
  50. 11.5" K3B-CAR Upper Receiver 11.5" K3B-CAR Upper Receiver
    11.5" K3B-CAR Upper Receiver
    K3B-CARUR

    11.5" K3B-CAR Upper Receiver

    This K3B variant has an 11.5" barrel with a permanently attached 5.5" flash suppressor. Available in 5.56 NATO Learn More
    $598.00

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  5. Pistol Uppers (AR15) (26)
  6. Pistol Caliber Pistol Length Upper (20)
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