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.
54 Item(s)
Grid List
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16" M4 Tactical Carbine Upper Receiver
Sometimes called the "alphabet gun". The A3-TC variant takes the K3B-M4 and adds a detachable c...
K3B-M4-A3-TC-UR$796.90 -
K45UR: 45 ACP Upper Receiver, 16"
Complete upper receiver assembly manufactured for 45 ACP and includes one 18 round polymer maga...
K45-UR$721.50 As low as: $701.50 -
K40UR: 16in. 40 S&W Upper Receiver Conversion Unit
Complete upper receiver assembly manufactured for 40 S&W; and includes one 20 round polymer maga...
K40-UR$721.50
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16in. LT M4 Upper Receiver
The LT model has a M4 style barrel. Other options are also included standard. Available in 5.56...
LTM4UR$696.80 -
16in. LTF Upper Receiver
The LTF model has fluting along the full length of the barrel increasing heat dissipation. Othe...
LTF UR$743.60 -
K16UR: 16in. K16 Upper Receiver
16" Bull barreled match grade 5.56x45 target/hunting upper. Great for an Olympic Arms or any ma...
K16UR$533.00
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K8MAGUR300: 24" .300 OSSM Upper Receiver
Upper conversion unit for your complete AR-15 lower receiver designed for the Winchester Super ...
K8MAGUR300$895.70 -
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K9UR-FT: 16" 9mm Flat-top Upper Receiver
Complete upper receiver assembly chambered in the wildly popular and affordable 9mm pistol cart...
K9UR-FT$721.50 As low as: $701.50
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16" K3B-M4 Upper Receiver
Features an M4 contoured barrel and M4 handguards. Available in 5.56 NATO
K3B-M4UR$588.90 -
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K68UR: 16" 6.8 SPC Upper Receiver
Complete upper receiver assembly manufactured for 6.8 Remington/SPC and includes one magazine.
K68UR$637.00
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K8MAGUR243: 24" .243 WSSM Upper Conversion Receiver Assembly
Upper conversion unit for your complete AR-15 lower receiver designed for .243 Winchester Super...
K8MAGUR243$895.70 -
K8MAGUR25: 24" .25 WSSM Upper Conversion Unit"
Upper conversion unit for your complete AR-15 lower receiver designed for .25 Winchester Super ...
K8MAGUR25$895.70 -
K8UR Targetmatch Upper Receiver
Top end assembly with a 20" bull Targetmatch barrel. Available in 5.56 NATO and 6.8 SPC
K8UR$560.30
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K9UR-OR: 9mm Optics Ready Upper Receiver, 16"
K9UR-OR Optics Ready
K9ur-or$767.00 As low as: $747.00 -
K40UR-OR: 40 S&W Optics Ready Upper Receiver, 16"
K40UR-OR Optics Ready
K40UR-OR$767.00 As low as: $747.00 -
K45UR-OR: 45 ACP Optics Ready Upper Receiver, 16"
K45UR-OR Optics Ready
K45UR-OR$767.00 As low as: $747.00
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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 ...
K16-204UR$591.50 -
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K10UR-FT: 16" 10mm Flat-top Upper
Complete upper receiver assembly chambered in the wildly popular and affordable 10mm pistol car...
K10ur-FT$721.50
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K40UR-FT: 16" 40 S&W Flat-top Upper Receiver
Complete upper receiver assembly chambered in the wildly popular and affordable 40 S&W; cartridg...
K40UR-FT$721.50 -
K24P-10-UR-OR: 10mm 11.5" AR15 Pistol/SBR upper
10mm 11.5" Optics ready AR15 pistol or SBR upper
K24P-10-ur-or$767.00 -
K10UR-OR: 10mm Optics Ready Upper Receiver, 16"
K10UR-OR Optics Ready
k10ur-or$767.00 As low as: $747.00
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K24P-300-OR-UR: 300 Blackout Upper
300 Blackout caliber 11.5" AR15 pistol or SBR upper, optics ready upper
K24P-300-or-ur$572.00 -
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K6T-Sale: 20" Ultramatch Tactical Upper Assem. .223 Remington
20" Ultramatch Tactical Upper: .223 Remington
K6T-SALE$726.70
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K30R16-SST UR: 16in. 7.62x39 K16 Style Upper Receiver
16" Bull barreled match grade 7.62x39 target/hunting upper. Great for an Olympic Arms or any m...
K30R16-SSTUR$399.00 -
GSG2-556UR-Sale: Gamestalker Upper Receiver
GSG2 5.56 Closeout Gamestalker Upper Receiver, Black/SS
GSG2-556UR$675.00 -
K8T-UR-SALE: Tactical Targetmatch Upper Receiver Closeout
K8: 20" Bull Barrel Tactical Targetmatch Upper. Chambered in 5.56 x 45
K8T-UR-SALE$449.00 As low as: $376.00
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K3B-CAR Upper LIMITED SALE
This K3B variant has an 11.5" barrel with a permanently attached 5.5" flash suppressor. Availab...
K3B-CARUR-SALE$399.00 -
K24P-10-UR-FT: 10mm 11.5" AR15 Pistol/SBR upper
10mm 11.5" Flat-top AR15 pistol or SBR upper
K24P-10-UR-FT$767.00 -
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K24P-10-UR: 10MM 11.5" AR15 Pistol/SBR upper
10 mm 11.5" AR15 pistol or SBR upper
K24p-10-ur$721.50 -
K24P-9-UR-OR: 9mm 11.5" AR15 Pistol/SBR upper
9mm 11.5" Optics ready AR15 pistol or SBR upper
K24P-9-ur-or$767.00 -
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16" 7.62 x 39mm Upper Receiver
Complete upper receiver assembly manufactured for 7.62 x 39mm and includes one magazine.
K30R-UR$588.90 -
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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
K868UR$598.00 -
K10UR 10mm Upper Receiver, 16" bbl.
Complete upper receiver assembly manufactured in 10 mm caliber. Includes one 18 round polymer m...
k10ur$721.50 -
24" .223 WSSM Upper Conversion Unit
Upper conversion unit for your complete AR-15 lower receiver designed for .223 Winchester Super...
K8MAGUR223$895.70
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K45UR-FT: 45 ACP Flat-top Upper Receiver, 16"
Complete upper receiver assembly chambered in 45 ACP and includes one 18 round polymer magazine...
K45UR-FT$721.50 As low as: $701.50 -
K9UR: 16" 9mm A2 Upper Receiver
Complete upper receiver assembly chambered in the wildly popular and affordable 9mm pistol cart...
K9UR$721.50 As low as: $701.50 -
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 m...
K30R16UR$618.80
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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...
K1668UR$591.50 -
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 a...
K16-300UR$591.50 -
K24P-UR: 11.5" barreled 5.56x45 Pistol/SBR upper
5.56x45 11.5" AR15 pistol or SBR upper
K24P-UR$526.50
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K24POR-UR: 5.56x45 AR15 pistol upper
5.56x45 caliber 11.5" AR15 pistol or SBR upper, optics ready
K24POR-UR$572.00 -
K24P-40-UR: 40 S&W caliber 11.5" AR15 Pistol/SBR upper
40 S&W; 11.5" AR15 pistol or SBR upper
K24P-40-UR$721.50 -
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
K24P-40-UR-OR$767.00
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K24P-45-UR: 45 ACP caliber 11.5" AR15 Pistol/SBR upper
45 ACP 11.5" AR15 pistol or SBR upper
K24P-45-UR$721.50 -
K24P-45-UR-OR: 45 ACP caliber 11.5" AR15 Pistol/SBR upper
45 ACP 11.5" Optics ready AR15 pistol or SBR upper
K24P-45-ur-or$767.00 -
54 Item(s)
Grid List