The CM10 Centerfeed is the version of the CM10 AR10 that Chattahoochee Munitions manufactures for 375 Raptor and 458 SOCOM XL. The standard CM10 feeds from conventional dual-feed LR/SR magazines. The Centerfeed feeds from a metal AICS-pattern magazine that presents every cartridge from the center, in line with the chamber. You do not choose between them by preference: the cartridge decides. The 375 Raptor and 458 SOCOM XL come only as a Centerfeed, and every other CM10 cartridge uses the standard CM10. Both are part of the CM10 AR10 rifles lineup.
CM10 vs CM10 Centerfeed at a Glance
| Feature | Standard CM10 | CM10 Centerfeed |
|---|---|---|
| Cartridges | 8.6 Blackout, 308 Winchester, 6.5 Creedmoor, 7mm-08, 338 Federal, 358 Winchester, 22 Creedmoor, 22-250, 6mm Creedmoor, 243 Winchester | 375 Raptor, 458 SOCOM XL |
| Receivers | 7075-T6 billet, SR25 pattern with DPMS High Profile compatibility | 7075-T6 billet, DPMS low profile, centerfeed AICS-pattern lower |
| Barrel extension | Standard AR10 | Centerfeed barrel extension |
| Magazine | Dual-feed LR/SR, Magpul PMAG | Modified MDT metal AICS pattern, double stack to single feed |
| Capacity included | 10 or 20 rounds, depending on the model | 10 rounds (375 Raptor), 7 rounds (458 SOCOM XL) |
| Magazine release | CM ambidextrous release | Paddle release in front of the trigger guard |
| Last-round bolt hold open | Yes | No; lock the bolt back manually |
| Barrel lengths | 8 to 24 inches | 12.5 and 16 inches |
| Gas journal | .750 inch on most cartridges, .875 inch on 8.6 Blackout | .875 inch |
| Muzzle threads | 5/8×24 on most cartridges | 11/16×24 |
| Gas block, buffer, trigger | Superlative Arms adjustable gas block, ODIN Works adjustable AR10 buffer, TriggerTech Duty 3.5 lb (both) | |
| Weight, 12.5 / 16 inch | 7.5 lb / 7.75 lb (308 Winchester) | 7 lb 8 oz / 7 lb 12 oz |
Why Does the CM10 Centerfeed Exist?
The 375 Raptor and 458 SOCOM XL are heavy subsonic cartridges. The 375 Raptor semi-auto load carries a 400 gr bullet, and the 458 SOCOM XL carries a 650 gr bullet, both loaded to 2.790 inches for the CM10. A standard 458 SOCOM stops at 2.260 inches because it has to fit an AR15 magazine, so the XL load is beyond the AR15 magazine limit and needs a large frame.
A large frame alone is not enough. A dual-feed LR/SR magazine presents cartridges alternately from the left and the right of the feed lips, and each round has to swing toward the chamber as the bolt strips it. A long, heavy subsonic bullet running at low pressure is demanding to feed that way. The Centerfeed removes that swing. Its modified MDT metal AICS-pattern magazine stacks rounds double inside the body and presents them one at a time from a single center position, and the centerfeed barrel extension is shaped for that path. The magazine, receivers, barrel extension, gas block and buffer work as one system.
What Is the Same on Both?
Both versions are complete factory CM10 AR10s with CNC-machined 7075-T6 billet receivers, an upper without a forward assist, a flared magazine well, a Superlative Arms adjustable gas block, an ODIN Works adjustable AR10 buffer and a TriggerTech Duty trigger in single-stage straight, single-stage curved or two-stage straight, all at 3.5 lb. Both use B5 Systems furniture and a CM10 LWS M-LOK handguard, and both are offered in Cobalt Kinetics Green Cerakote and FDE Metallic Cerakote. The adjustable gas block and buffer let either version be tuned to the ammunition and suppressor you use.
Magazines: LR/SR vs AICS Pattern
The standard CM10 takes dual-feed LR/SR magazines such as the Magpul PMAG, the same family used by most SR25-pattern rifles. Chattahoochee Munitions sells them as the 308 AR10 magazine, the 8.6 Blackout magazine, the 358 Winchester magazine and the 243 Winchester magazine.
The Centerfeed takes AICS-pattern magazines only. Standard AR10 and SR25-pattern magazines will not seat in the Centerfeed lower. Chattahoochee Munitions modifies genuine MDT metal AICS-pattern magazines for each cartridge: the 10-round CM10 375 Raptor magazine and the 7-round 458 SOCOM XL magazine. The 458 SOCOM XL magazine also fits the CM7S bolt action, so one spare serves both platforms. It is set up for XL length, and shorter standard 458 SOCOM loads can move inside it and may not feed.
Handling Differences on the CM10 Centerfeed
- No last-round bolt hold open: the bolt closes on an empty chamber after the last shot. The bolt catch still locks the bolt back manually. Always lock it to the rear and look in the chamber to confirm the rifle is unloaded.
- Paddle magazine release: push the paddle in front of the trigger guard forward to drop the magazine, then pull down on a fresh magazine to confirm it is seated.
- Firing pin return spring (458 SOCOM XL): the 458 SOCOM XL Centerfeed has a firing pin return spring in the bolt carrier group to help prevent slam fires. Never fire it without the spring, and keep the spring with the firing pin when you clean it.
The Manuals page has the CM15 and CM10 safety manual and the CM10 Centerfeed addendum. Read both before you fire the Centerfeed.
Subsonic and Suppressors
Both versions run subsonic ammunition when it is matched to the gas setup. The Centerfeed is subsonic first: the 12.5-inch 375 Raptor and both 458 SOCOM XL lengths are set up for heavy subsonic loads, and the 16-inch 375 Raptor also runs the 190 gr supersonic load. On the standard CM10, 8.6 Blackout runs subsonic and supersonic, and the 12.5-inch 1:5 twist CM10-SD 308 Subsonic AR10 is designed for subsonic 308 Winchester. With subsonic ammunition, Chattahoochee Munitions recommends an enclosed suppressor on either version, such as the PLACID 375 on 375 Raptor. With supersonic ammunition, a flow-through suppressor is recommended.
Which CM10 Should You Choose?
- Choose the CM10 Centerfeed for a semi-automatic 375 Raptor or 458 SOCOM XL: heavy subsonic bullets for suppressed hog control, and bear defense with the 458 SOCOM XL or 375 Raptor. Read the Raptor Paddock and Terminal 458.
- Choose the standard CM10 for 8.6 Blackout, 308 Winchester, the 308 based cartridges in Variant Valley or the predator cartridges in Predator Plains, and when you want common LR/SR magazines and a last-round bolt hold open.
If you want the same cartridges in a bolt action, read 375 Raptor bolt action vs semi-auto and 458 SOCOM bolt action vs semi-auto.
CM10 Centerfeed FAQ
Who makes the CM10 Centerfeed?
Chattahoochee Munitions manufactures the CM10 Centerfeed in Roswell, Georgia, as complete factory 375 Raptor and 458 SOCOM XL AR10s in 12.5-inch SBR and 16-inch rifle configurations.
What is the difference between the CM10 and the Centerfeed?
The CM10 Centerfeed uses DPMS low profile billet receivers, a centerfeed barrel extension and a metal AICS-pattern magazine that feeds from the center. The standard CM10 uses SR25-pattern receivers and dual-feed LR/SR magazines. The gas block, buffer and trigger are the same.
Can I use a PMAG in a CM10 Centerfeed?
No. It takes AICS-pattern magazines only. Standard AR10 and SR25-pattern magazines, including LR/SR PMAGs, will not work in the Centerfeed lower.
Does the CM10 Centerfeed lock open on the last round?
No. The bolt closes on an empty chamber after the last round. Lock it to the rear with the bolt catch and inspect the chamber before you reload or set the rifle down.
Which cartridges use the CM10 Centerfeed?
375 Raptor and 458 SOCOM XL. Every other CM10 cartridge uses the standard CM10.
Why does 458 SOCOM XL need an AR10?
Standard 458 SOCOM is limited to 2.260 inches by the AR15 magazine. The 650 gr 458 SOCOM XL load is 2.790 inches in the CM10, beyond the AR15 magazine limit, so it needs a large-frame receiver and an AICS-pattern magazine. Read What Is 458 SOCOM XL?.
Will standard 458 SOCOM ammunition work in the Centerfeed?
The rifle is chambered in 458 SOCOM, but its magazine is set up for XL length. Shorter standard 458 SOCOM loads can move inside the magazine and may not feed. Use the Chattahoochee Munitions 650 gr XL load.
Is the Centerfeed heavier than a standard CM10?
No. A 12.5-inch Centerfeed weighs 7 lb 8 oz and a 16-inch weighs 7 lb 12 oz, about the same as a 308 Winchester CM10 of the same length. Listing weights are shipping weights.
Does Cobalt Kinetics Green Cerakote mean another company makes the CM10 Centerfeed?
No. Cobalt Kinetics Green Cerakote is the finish color. Chattahoochee Munitions manufactures every CM10 and CM10 Centerfeed.