Centurion Arms CM4 Complete 11.5″ Pistol | 5.56 Carbine Gas System


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Weight: 5.4 lbs
Length: 27in

–Centurion Arms 11.5″ Carbine Gas 5.56mm chrome hammer forged barrel, government profile under the handguard, 1/7 twist, Independently Certified MIL-SPEC 11595E barrel steel, specifically engineered for machine guns for longer life (most all hammer forged barrels on the market are not made of this steel), USGI 5.56mm NATO, chrome lined bore and chamber. HPT/MPI (High Pressure Test/Magnetic Particle inspected), per MIL-SPEC. Manganese Phosphate Finish on entire barrel,
–Centurion Arms CM4 Forged Upper receiver is standard forged Mil-Spec with M4 Extended feed ramps
–Centurion Arms low profile pinned gas block
–10.5″ MLOK Centurion Arms CMR Rail
–Carbine-length gas tube
–Standard A2 Flash Hider
–BCG: Full Auto machined from MIL-SPEC Carpenter 158 Steel. MPI (Magnetic Particle Inspected), Shot Peened, Tool Steel Extractor w/enhanced extractor spring, Chrome Lined Carrier, Hardened, Chrome Lined Gas Key w/staked Grade 8 Fasteners as per MIL-SPEC.

–Centurion Arms CM4 Forged Lower Receiver
–Receiver Plate-Standard or QD
–Fire Control Group: MIL Spec
–Trigger Guard: Aluminum Winter Trigger Guard
–Buffer: H2
–Grip: A2
–Arm Brace: SBA3


Includes: Pistol, (1) 30rd Magazine, Digital USGI Manual and Centurion Arms Propaganda

Additional information

Weight 33 oz
Dimensions 6 × 9 × 4 in
Thread Pitch


1 review for Centurion Arms CM4 Complete 11.5″ Pistol | 5.56 Carbine Gas System

  1. brittsavoie12 (verified owner)

    I purchased the CM4 because of Centurion’s reputation for building quality carbines with an impressive balance between reliability and accuracy. The features of the firearm that met and exceeded my expectations were the following:
    •Pinned gas block
    •Properly-sized gas port and buffer/buffer spring combo facilitates an appropriately light recoil impulse (55gr brass cased ammunition ejects into a consistently small pile at approximately 4:30)
    •Cam pin features the Centurion logo with the bullet tip facing forward (likely meant to assist with consistently positioning the pin in the same direction after disassembly and reassembly during cleaning)
    •Noticeably light weight and well-balanced
    •Impressive staking on the BCG and castle nut
    •Exceptionally polished feed ramps

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