Much noise has been made over the past few years about the integration of a multi-caliber AR-style platform to the U.S. armed forces.
Now Colt has introduced its solution with the CM901 Colt Modular Carbine.
“Modular” and “multi-caliber” are actually understatements, since the CM901 is, hands, down, the most versatile battle rifle/assault rifle we’ve ever seen in both respects.
The heart of this versatility lies in the combination of the patent-pending AR (AR-10/AR-15)-format “universal” multi-caliber lower receiver and conversion system and Colt Defense’s various AR operating systems and uppers, which lets you configure the gun in so many mission-specific ways. It’s almost mind-boggling.
The CM901 provides a truly sumptuous feast of versatility with regard to configuration options.
The Colt CM901 Modular Carbine is a select-fire AR (AR-10/AR-15)-platform weapon, so it immediately looks, feels, handles and shoots in a way that’s immediately familiar to all military end-users, including general infantry personnel. It also benefits from the AR platform’s now legendary ergonomics/usernomics.
Configurable in Many Calibers
The CM901 multi-caliber battle carbine can be configured in any/every caliber between 7.62×51mm NATO (7.62mm NATO)/.308 Win. and 5.56×45mm NATO (5.56mm NATO)/.223 Rem., including 6.8 SPC (6.8×43mm SPC) and 6.5 Grendel, depending on what U.S. military end-users require.
To switch from 7.62mm to 5.56mm:
- Push out the two receiver pins.
- Take off the 7.62×51mm upper module
- Slap the 5.56mm upper module on.
- Push the two receiver pins back in
- You’re good to go.
Accepts Legacy Milspec 5.56mm Upper Receivers
The CM901 universal lower receiver accepts any/all legacy MILSPEC 5.56mm NATO AR rifle/carbine/SBR upper receivers already in the U.S. military inventory, including the:
- Colt M4/M4A1 Carbine 14.5″ AR carbine
- M4 Commando 11.5″ AR SBR
- MK18/CQBR (Close Quarters Battle Receiver) 10.3″ AR SBR
- M16A3/A4 20″ DGI rifle uppers.
The CM901 lower also accepts the…
- Colt LE6940 16″ monolithic upper
- Colt LE6920 16″ M4/M4A1 Carbine-type uppers.
Thus, 5.56mm barrel length is determined by whatever AR upper you want to use.
Fully Ambidextrous Controls
The CM901 sports fully ambidextrous controls a.k.a. “full ambi controls” including…
- Ambidextrous safety/selector switch
- Bolt catch hold-open/release lever
- Magazine release button
The MagPul 20LR 7.62 Magazine
The CM901, when configured for .308 Win, uses the MagPul 20LR 7.62 magazine. The weapon also accepts the SR25/M100 7.62mm magazine. The weapon, when configured for 5.56mm, accepts all MIL-SPEC 5.56mm magazines.