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Complete Upper Assemblies

A complete upper is a full AR-15 upper half that includes the upper receiver, a barrel, a muzzle device, and (optional) bolt carrier group. 

What is the advantage of buying a complete upper?

Because it is the complete upper half of the rifle, all you need is a lower half and you will have a fully functioning rifle. Many people buy complete uppers in .22LR or .300 Blackout, and this allows you to quickly swap to different calibers by just switching upper receivers.

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$629.99 $694.00

This DPMS Oracle LR-308 UComplete Upper Receiver Assembly is fully assembled and ready for installation on any compatible .308 lower. This is a solid entry-level upper that includes a bolt carrier group, standard Glacier handguard, and a railed gas block.The black parkerized barrel features a 1 in 10" rifling twist rate, capable stabilizing a wide selection of different bullet weights.Technical Information...

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$459.99 $539.99

An excellent value for your next build, this complete upper includes the bolt carrier group. Just add it to any lower and you're ready to go! This Bushmaster XM15 A3 upper comes fully assembled with charging handle, forward assist, ejection port cover, bolt and bolt carrier assembly, and it will attach to any standard AR-15 lower receiver. The 16" chrome lined barrel features a...

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$499.99

Great value on a Mil Spec complete upper receiver with bolt carrier group and a lifetime warranty! This CORE15™ complete upper includes an accurate 16" 4150 chrome lined barrel, a chromed bolt carrier group, and a standard M4 handguard with heat shields. Specifications: CORE15™ Mil-Spec Forged 7075-T6 M-4 Upper Receiver, Type III Class II Hard-coat anodized finish, M4 Feed Ramps, (1913...

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$692.49 $749.95

The iconic Mk4LE Upper Group in 9mm Luger. Features a nitrided 16.1″ 4140 CrMo steel barrel in a M4 profile, which includes a “F” marked front sight base. Upper Group consists of: Upper Receiver Assembly (Upper Receiver, Ejection Port Cover, Forward Assist, Gas Deflector) Barrel Sub-Assembly Hand Guard and Barrel Nut Charging Handle Bolt Carrier Group Specifications: Caliber: 9mm Barrel:...

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$556.49 $599.95

This 22LR Mk4 T Upper Group introduces CMMG’s RKM series of KeyMod free float hand guards.  It also features a nitrided 4140 CrMo M4 profile barrel. Caliber: 22 long rifle Barrel: 16”, 1:16 twist, M4 profile, 4140 CM, SBN Muzzle: A2 comp., threaded 1/2-28 Hand Guard: CMMG RKM11 KeyMod hand guard Receiver: Forged 7075-T6 AL M4 type upper Upper Group...

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$687.49 $699.95

This 300 BLK Mk4 T Upper Group introduces CMMG’s RKM series of KeyMod free float hand guards. It features a nitrided 4140 CrMo steel barrel in a medium taper profile. Caliber: 300 Blackout Barrel: 16.1″, 1:7 twist, medium taper, 4140CM, SBN Muzzle: A2 comp., threaded 5/8-24 Hand Guard: CMMG RKM11 KeyMod hand guard Receiver: Forged 7075-T6 AL M4 type upper...

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$710.49 $749.95

The 300 BLK Mk4 T Upper Group introduces CMMG’s RKM series of KeyMod free float hand guards. It includes a 416 stainless steel barrel in a medium taper profile. Caliber: 300 Blackout Barrel: 16.1″, 1:7 twist, medium taper, 416SS, bead blasted finish Muzzle: A2 comp., threaded 5/8-24 Hand Guard: CMMG RKM11 KeyMod hand guard Receiver: Forged 7075-T6 AL M4 type...

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$941.99 $999.95

The Mk3 is the perfect 308 WIN Upper Group for the tree stand or target range. The Mk3 utilizes an 18″ 416 stainless steel heavy taper barrel, and CMMG’s RKM15 KeyMod hand guard. Each Upper Group is covered by CMMG’s lifetime quality guarantee. Caliber: 308 WIN Barrel: 18” stainless steel 1:10 twist heavy taper profile Muzzle: A2 compensator, threaded 5/8-24 Hand...

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$654.99 $674.95

The Mk4LE Optics Ready Upper Group is set up for your favorite scope or red dot sight as it has no front sight base to interfere with the sight picture. The Mk4LE OR comes with CMMG’s lifetime quality guarantee. Caliber: 300 Blackout Barrel: 16.1″, 1:7 twist, multi-role, 4140CM, SBN Muzzle: A2 comp., threaded 5/8-24 Hand Guard: M4 type 2-piece hand...

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Uncompromising quality meets unbeatable value. The AT3 Tactical FFQR Complete Carbine Upper. Our 5.56 Upper featuring a 16" Carbine Barrel and AT3 Pro Series Free Float Quad Rail. About Our Uppers The two most critical parts of a reliable, accurate AR15 are the bolt carrier group (BCG), and the barrel. That's why the FFQR Series feature a Spike's Tactical BCG...

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The .308 Mk3 CBR Upper Group features a 16″ nitrided 416 stainless steel medium taper profile barrel in 308 WIN. The Mk3 CBR is equipped with CMMG’s own SV muzzle brake and RKM15 KeyMod hand guard. Specifications: Caliber: 308 WIN Barrel: 16.1” 1:10 twist, medium tapered, 416SS, SBN Muzzle: CMMG SV brake, threaded 5/8-24 Hand Guard: CMMG RKM15 Receivers: Billet...