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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K24P-9-UR: 9MM 11.5" AR15 Pistol/SBR upper
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K24P-45-UR-OR: 45 ACP caliber 11.5" AR15 Pistol/SBR upper
K24P-45-ur-orK24P-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 -
K24P-45-UR: 45 ACP caliber 11.5" AR15 Pistol/SBR upper
K24P-45-URK24P-45-UR: 45 ACP caliber 11.5" AR15 Pistol/SBR upper
45 ACP 11.5" AR15 pistol or SBR upper Learn More$721.50 -
K24P-40-UR-OR: 40 S&W caliber 11.5" AR15 Pistol/SBR upper
K24P-40-UR-ORK24P-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 -
K24P-10-UR-OR: 10mm 11.5" AR15 Pistol/SBR upper
K24P-10-ur-orK24P-10-UR-OR: 10mm 11.5" AR15 Pistol/SBR upper
10mm 11.5" Optics ready AR15 pistol or SBR upper Learn More$767.00 -
K40UR-FT: 16" 40 S&W Flat-top Upper Receiver
K40UR-FTK40UR-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 -
K10UR-FT: 16" 10mm Flat-top Upper
K10ur-FTK10UR-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 -
LTFP-6.8UR; 6.8 Remington Upper
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K16-204UR: 16in. .204 Ruger® K16 Style Upper Receiver
K16-204URK16-204UR: 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 -
K45UR-OR: 45 ACP Optics Ready Upper Receiver, 16"
K45UR-ORK45UR-OR: 45 ACP Optics Ready Upper Receiver, 16"
K45UR-OR Optics Ready Learn More$767.00 As low as: $747.00 -
K40UR-OR: 40 S&W Optics Ready Upper Receiver, 16"
K40UR-ORK40UR-OR: 40 S&W Optics Ready Upper Receiver, 16"
K40UR-OR Optics Ready Learn More$767.00 As low as: $747.00 -
K9UR-OR: 9mm Optics Ready Upper Receiver, 16"
K9ur-orK9UR-OR: 9mm Optics Ready Upper Receiver, 16"
K9UR-OR Optics Ready Learn More$767.00 As low as: $747.00 -
K10UR-OR: 10mm Optics Ready Upper Receiver, 16"
k10ur-orK10UR-OR: 10mm Optics Ready Upper Receiver, 16"
K10UR-OR Optics Ready Learn More$767.00 As low as: $747.00 -
K24P-40-UR: 40 S&W caliber 11.5" AR15 Pistol/SBR upper
K24P-40-URK24P-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 -
K24POR-UR: 5.56x45 AR15 pistol upper
K24POR-URK24POR-UR: 5.56x45 AR15 pistol upper
5.56x45 caliber 11.5" AR15 pistol or SBR upper, optics ready Learn More$572.00 -
GSUR: Gamestalker Upper Receiver
GSUR -
16" 7.62 x 39mm Upper Receiver
K30R-UR16" 7.62 x 39mm Upper Receiver
Complete upper receiver assembly manufactured for 7.62 x 39mm and includes one magazine. Learn More$588.90 -
K6: 20" Ultramatch Upper Receiver Assembly
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K868UR: 20" Targetmatch Upper Receiver 6.8 Remington
K868URK868UR: 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 -
K10UR 10mm Upper Receiver, 16" bbl.
K10URK10UR 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