CM10 375 Raptor Semi Auto SBR 12.5″ – Carbon Grey Cerakote

Chattahoochee Munitions manufactures this 375 Raptor semi auto, the CM10, a complete factory 12.5-inch SBR finished in Carbon Grey Cerakote with black furniture. It pairs a Mos-Tek 416R stainless barrel with a 1:8 twist, a centerfeed system, and an adjustable gas block and buffer tuned for the 400 gr subsonic load.

The 375 Raptor was designed by Arne Brennan and shares the .308 bolt face, but a reliable semi-automatic takes more than a barrel. See every configuration in the Raptor Paddock, and compare platforms in 375 Raptor bolt action vs semi-auto.

What It Takes to Run a 375 Raptor Semi Auto

A 375 Raptor semi auto has to feed a long cartridge and cycle on a low-pressure subsonic load. The CM10 does both: a centerfeed system and a modified MDT metal magazine feed the 2.790-inch subsonic round, and the adjustable gas block and buffer let you tune the 375 Raptor semi auto for suppressed or unsuppressed subsonic shooting. That engineering is why the CM10 is a dependable semi-auto in a cartridge that many expect to be a simple barrel change.

Pair this 375 Raptor semi auto with an enclosed suppressor and 400 gr subsonic ammunition.

Centerfeed System and Magazine

A dependable 375 Raptor semi-auto is more than a new barrel on a .308. The 400 gr subsonic cartridge is long (2.790 inches for the semi-auto load) and runs at low pressure, so the CM10 uses a centerfeed system: a DPMS low-profile 7075-T6 billet upper and lower, a centerfeed barrel extension, and an AICS-pattern lower that feeds from one included 10-round modified MDT metal magazine. Spares are available as CM10 375 Raptor magazines.

Gas, Buffer, and Bolt Carrier Group

A Superlative Arms .875-inch adjustable gas block and an Odin Works adjustable AR10 buffer let this 375 Raptor Semi Auto be tuned to cycle the 400 gr subsonic load, suppressed or unsuppressed. The mil-spec 9310 bolt is high-pressure tested, magnetic-particle inspected, shot peened, and nitrided, with a nitride carrier, a staked gas key, and a tool-steel extractor with a T.E.A. spring. The CM10 Warhammer ambidextrous charging handle is made with Breek Arms.

Barrel and 1:8 Twist

The 12.5-inch barrel is made by Mos-Tek from 416R stainless steel with 5R rifling and a 1:8 twist, finished in E100 Blackout Cerakote, with a .875-inch gas journal and 11/16×24 muzzle threads. The 1:8 twist gives the long 400 gr subsonic bullet a wide stability margin over Maker Bullets’ 1:11 guidance. Read 375 Raptor twist rate for the details.

Trigger, Controls, and Handguard

Choose a TriggerTech Duty 3.5 lb trigger in single-stage flat, single-stage curved, or two-stage flat. The lower has a CM ambidextrous safety, a paddle magazine release, and an integral trigger guard. The CM10 LWS 15-inch M-LOK handguard has a steel barrel nut, QD points at 3 and 9 o’clock, and a full-length Picatinny top rail, with B5 Systems Bravo stock and grip.

Ammunition

From the 12.5-inch barrel, the Chattahoochee Munitions 400 gr Maker REX semi-auto subsonic load averages about 1,012 fps, roughly 910 ft-lb at the muzzle. Use the semi-auto load: 400 gr subsonic for semi-auto. The bolt action loads are not intended to cycle a semi-automatic. Full tables are in 375 Raptor ballistics.

Suppressing the CM10

Use a suppressor rated for .375 caliber. With subsonic ammunition, Chattahoochee Munitions recommends an enclosed suppressor such as the PLACID 375. The CM10 has been tested with the PLACID 375. The 375 Raptor suppressor guide covers the choice in detail.

This SBR is subject to National Firearms Act requirements; see NFA Firearms.

Carbon Grey Cerakote Finish

This CM10 has Carbon Grey Cerakote receivers, handguard, and buffer tube with black B5 Systems furniture and rail covers. Mechanical specifications match the Cobalt Kinetics Green Cerakote and FDE Metallic Cerakote variations.

375 Raptor Semi Auto Specifications

• Manufacturer: Chattahoochee Munitions
• Platform: CM10 large-frame semi-automatic (AR10 pattern)
• Chambering: 375 Raptor (designed by Arne Brennan)
• Configuration: SBR
• Barrel: 12.5-inch Mos-Tek 416R stainless steel, 5R rifling, centerfeed barrel extension, .875-inch gas journal
• Twist rate: 1:8
• Barrel finish: E100 Blackout Cerakote
• Muzzle: 11/16×24 threads; thread protector or muzzle brake option
• Receivers: 7075-T6 billet, CNC machined, DPMS low profile, centerfeed AICS-pattern lower, no forward assist
• Gas: Superlative Arms .875-inch adjustable gas block, CM carbine gas tube (Melonite)
• Buffer: Odin Works adjustable AR10 buffer, CM mil-spec buffer tube, QD end plate
• Bolt carrier group: Mil-spec 9310 bolt, HPT/MPI, shot peened, nitride; nitride carrier and staked gas key; tool-steel extractor with T.E.A. spring
• Charging handle: CM10 Warhammer ambidextrous, 7075, with Breek Arms
• Trigger: TriggerTech Duty 3.5 lb: single-stage flat, single-stage curved, or two-stage flat
• Lower controls: CM ambidextrous safety, paddle magazine release, integral trigger guard
• Handguard: CM10 LWS 15-inch M-LOK, 6061, steel barrel nut, QD at 3 and 9 o’clock, full-length Picatinny top rail
• Furniture: B5 Systems Bravo stock, grip, and rail covers
• Finish: Carbon Grey Cerakote receivers, handguard, and buffer tube with black B5 Systems furniture and rail covers
• Magazine: One 10-round modified MDT metal AICS-pattern
• Length of pull: 11.75-15.00 inches
• Overall length: 29.25-32.50 inches
• Weight: 7.5 lb, complete firearm; the listing weight is for shipping

375 Raptor Semi Auto FAQ

Who makes a 375 Raptor semi auto?

Chattahoochee Munitions manufactures the CM10, a complete factory 375 Raptor semi-automatic in 12.5-inch SBR and 16-inch rifle configurations, in Carbon Grey Cerakote, FDE Metallic Cerakote, and Cobalt Kinetics Green Cerakote.

Is the CM10 375 Raptor just a .308 AR10 with a new barrel?

No. It uses a centerfeed system, a modified MDT metal AICS-pattern magazine, an adjustable gas block, and an adjustable buffer to feed and cycle long, low-pressure 375 Raptor rounds reliably.

What ammunition should I use in the CM10 375 Raptor?

The Chattahoochee Munitions 400 gr subsonic load for semi-auto. The bolt action loads are not intended to cycle a semi-automatic.

What magazine does the CM10 375 Raptor use?

A modified MDT metal AICS-pattern magazine. One 10-round magazine is included.

What suppressor should I use on the CM10 375 Raptor?

An enclosed suppressor such as the PLACID 375 with subsonic ammunition. Any suppressor must be rated for .375 caliber.

What twist rate does the CM10 375 Raptor use?

A 1:8 twist in a Mos-Tek 416R stainless barrel with 5R rifling, finished in E100 Blackout Cerakote.

How much does the CM10 375 Raptor SBR weigh?

The complete firearm weighs 7.5 lb. Any heavier listing weight is the shipping weight.

Who designed the 375 Raptor?

The 375 Raptor was designed by Arne Brennan. Chattahoochee Munitions manufactures 375 Raptor firearms, barrels, magazines, suppressors, and ammunition.