AR-15 Upper Parts

Centurion Arms C4 Quad Rail Handguard - Carbine Cutout The Centurion patent-pending C4 rail system is a lightweight, rugged, 2-piece free float rail that, when installed, gives the uppers a continuous 12 o’clock rail. The C4 system is the lightest...

Centurion Arms Bolt Carrier Group Precision Engineering for Reliable AR Performance The Centurion Arms C4 Bolt Carrier Group delivers the reliability and durability you need for your AR platform. Built with MPI-tested bolts and a full auto carrier, this...

Centurion Arms C4 Quad Rail Handguard The Centurion Arms C4 rail is a lightweight rail system which clamps onto standard AR-15 barrel nuts. This strong and lightweight 2-piece design can be installed easily onto standard AR-15 uppers after removing the...

Centurion Arms CM4 5.56 Forged AR-15 Upper Receiver The Centurion Arms CM4 Forged AR-15 Upper Receiver is designed to be compatible with any Mil-Spec Lower. It is forged from 7075-T6 aluminum and is Type III Class 2 hardcoat anodized black to military...

Centurion Arms C4 M-LOK Handguard - 12"/Front Sight Cutout Centurion Arms LLC is happy to announce the C4 M-LOK rail.C4 MLOK 12in FSP (For Carbine Gas FSB's) The MLOK C4 rail system is based off the patented quad rail version. It is a lightweight,...

Centurion Arms C4 Quad Rail Handguard - 12"/Front Sight Cutout Contrary to popular belief, two-piece quad rail handguards are not disappearing from the market and still offer many benefits like full length picatinny rails that provide a solid mounting...

The Centurion Arms cold hammer forged 5.56 AR-15 barrels are made from high quality 41V50 Chrome Moly Vanadium—steel specifically designed for machine gun barrels—so you know it will last thousands of rounds. In order to get the 1:7 twist...

Centurion Arms RECCE 14.5" 5.56 NATO 1:7 416R Stainless Steel Mid-Length Barrel These are produced with the same chamber as our Spec. MK12 barrels with a slightly heavier profile. Built for reliability and accuracy. Available in both 14.5" and...

Centurion Arms C4 M-LOK Handguard - Carbine Cutout Centurion Arms LLC is happy to announce the C4 MLOK® rail.C4 MLOK CARBINE CUT The MLOK C4 rail system is based off the patented quad rail version. It is a lightweight, rugged, 2-piece free float rail...

Centurion Arms C4 Quad Rail Handguard - Midlength Cutout The C4 rail system is a lightweight, rugged, 2-piece free float rail that, when installed, gives the uppers a continuous top rail. The Mid-length cutout version allows for longer bottom/side rails...

Centurion Arms AR-15 5.56 Chrome Carrier - Sand Rail Cut (Carrier ONLY) The Centurion Arms Sandcutter Bolt Carrier is a ready drop-in bolt carrier for use with your existing components. The bolt carrier is finished in hard chrome for easier cleaning and...

Centurion Arms AR-15 CM4 Forged 5.56 Stripped Thermal Fit Upper Receiver Centurion Arms forged upper receivers are a great complement to their forged lower receivers.  The thermal fit inner dimension measures at .997 -0.0/+0.001" and requires the...

Centurion Arms RECCE 5.56 NATO 1:7 R5 416R Stainless Steel Mid-Length Barrel These are produced with the same chamber as our Spec. MK12 barrels with a slightly heavier profile. Built for reliability and accuracy. Best option for long range, high...

Centurion Arms .750 Low Profile Gas Block - Phosphate With the all of the free float rail systems currently being offered for the AR15 and M4 weapon systems, the Centurion Arms LLC gas block is small enough to fit under most rail systems. These gas...

Centurion Arms AR-15 5.56 Chrome BCG, Sand Rail Cut w/ Chrome V2 Bolt The Centurion Arms V2 is the next evolution in high-reliability bolt carrier groups for use in standard barrel extensions. The V2 Sandcutter Chrome Bolt Carrier Group from Centurion...

Centurion Arms AR-15 CMR M-LOK Handguard The Centurion Arms CMR is designed to be a lightweight, simple, and effective free float handguard that is highly configurable for any mission. It features a rigid picatinny top rail for mounting back up iron...

The Centurion Arms C4 Billet AR-15 Upper Receiver is designed to be used with the C4 Billet Lower. It is machined from a solid block of 7075-T6 aluminum and is Type III Class 2 hardcoat anodized black to military standards. It features a flat...

Centurion Arms C4 M-LOK Handguard - 12" Centurion Arms LLC is happy to announce the C4 MLOK® rail.The MLOK C4 rail system is based off the patented quad rail version. It is a lightweight, rugged, 2-piece free float rail that when installed gives the...

Centurion Arms C4 M-LOK Handguard - Midlength Cutout Centurion Arms LLC is happy to announce the C4 M-LOK rail. C4 MLOK MID CUT The MLOK C4 rail system is based off the patented quad rail version. It is a lightweight, rugged, 2-piece free float rail that...

The Centurion Arms cold hammer forged 5.56 AR-15 barrels are made from high quality 41V50 Chrome Moly Vanadium—steel specifically designed for machine gun barrels—so you know it will last thousands of rounds. In order to get the 1:7 twist...

The Centurion Arms cold hammer forged 5.56 AR-15 barrels are made from high quality 41V50 Chrome Moly Vanadium—steel specifically designed for machine gun barrels—so you know it will last thousands of rounds. In order to get the 1:7 twist...

Centurion Arms Hammer Forged 5.56 Mid-Length Barrel - 14.5" The Centurion Arms cold hammer forged 5.56 AR-15 barrels are made from high quality 41V50 Chrome Moly Vanadium—steel specifically designed for machine gun barrels—so you know it will...

The Centurion Arms cold hammer forged 5.56 AR-15 barrels are made from high quality 41V50 Chrome Moly Vanadium—steel specifically designed for machine gun barrels—so you know it will last thousands of rounds. In order to get the 1:7 twist...

Centurion Arms MK12 18" 5.56 NATO 1:7 416R Stainless Steel Rifle Length Barrel These are Crane Spec. MK12 barrels. These barrels are the result of tens of thousands of dollars in development done by the U.S. government to give our Special Operations guys...

Centurion Arms MK12 18" 5.56 NATO 1:7 R5 416R Stainless Steel Rifle Length Barrel Centurion Arms MK12 Rifle Barrels are the result of development done by the U.S. government to give Special Operations forces the best possible weapon system. Troops who...