CM10 358 Winchester AR10 18″ Rifle FDE Metallic

This is a 358 Winchester AR rifle from Chattahoochee Munitions. We have been building in less mainstream calibers since our inception, across both AR and Bolt-Action platforms. 8.6BLK, 243 Win, 22-250 Rem, 338 Spectre, 400 Legend, 338 Federal, 7mm-08, etc. Experience building with various lowers, uppers, and handguards, both low- and high-profile, allowed us to weigh the pros and cons and create our perfect version of the rifle.

This will be one of the sturdiest-feeling weapons, as everything is designed in tight tolerances. All of our rifles are equipped with HIPERFIRE (High Performance Firearms) Triggers; all are 2.5lb single-stage Reflex (curved) or Competition (straight with shoe) or X2S Mod3 2-Stage; Reflex is pictured, Odin Adjustable Buffers, and Superlative Arms adjustable gas blocks.

CM10 Upper and Lower Receiver:
SR25 Pattern through DPMS High Profile specs, such as 16TPI barrel nut, barrel extension, and BCG compatibility
CNC machined from 7075-T6 billet aluminum
Lightweight FCG Faces and Mag-well
Lightweight Cuts on Upper with no Forward Assist
Pictogram style Fire/Safe engravings on both sides
Integral trigger guard for added overall strength
Machined (not broached) Mag-well with wide flare
FDE Metallic Cerakote

Lower Parts:
CM Ambi Safety
CM Ambi Mag Release
CM10 Pivot and Takedown Pins
HIPERFIRE 2.5lb single stage Reflex (curved) or Competition (straight with shoe) Trigger and pins, or Hiperfire X2S Mod3 2-Stage – pictured with Reflex
CM10 Ambi Bolt Release
B5 Systems Coyote Grip

Receiver Extension:
B5 Systems Bravo Stock – Coyote
CM Milspec Buffer Tube – FDE Metallic Cerakote
QD Endplate
Odin Adjustable Buffer AR10

Upper:
CM10 Low Mass Bolt Carrier Group

• Milspec 9310 steel
• HPT Bolt (High Pressure Tested/ Proof)
• MPI Bolt (Magnetic Particle Inspected)
• Shot Peened Bolt
• Nitride-coated bolt
• Nitride-coated Carrier
• Nitride-coated Gas Key
• Gas Key Hardened to USGI Specifications
• Grade 8 Hardened Fasteners Key Staked Per Mil-Spec
• Tool Steel Extractor
• T.E.A Extractor Spring
• Black Extractor Insert
• Mil-Spec Crane O-Ring

CM10 Ambi Charging Handle – 7075 Aluminum
CM Rifle Length Gas Tube – Melonite
Superlative Arms .750 Adjustable Gas Block – Melonite
CM10 LWS 15″ Mlok Handguard – FDE Metallic Cerakote

• 6061 Aluminum
• Dual Taper Attachment System
• Steel Barrel Nut
• QD Attachment at 3 and 9 o’clock positions
• MLOK attachment on the sides and bottom
• Full Picatinny Top Rail

B5 Systems Coyote Rail Covers
Pictured with Silencerco ASR muzzle device; can sub for Rugged, Dead Air Keymo, Yankee Hill, Q Cherry Bomb

Barrel:

CM 358 Winchester AR10 18″ Barrel

• CrMV
• 1:14 Twist
• 5/8×24 thread pitch
• .750 gas journal
• 5R Rifling
• Tactical Grey Cerakote

Magazine:
1x10rd PMAG 7.62 Coyote

OAL: 35″ to 38.250″
OAW: 7lb/14oz with unloaded magazine and no accessories  (weight and dimensions on other tab are for shipping purposes)
LOP: 11.875″ – 15.25″

Warranty – Limited Lifetime
Limited to the original purchaser
Limited regarding functional performance
Limited regarding the original configuration

Unleash Devastating Timber Power with the CM10 358 Winchester

When hunting dense brush, thick timber, or heavy game where raw knock-down force is paramount, the 358 Winchester reigns supreme. Chattahoochee Munitions harnesses the massive terminal impact of this classic brush cartridge inside our custom semi-automatic CM10 platform. Engineered for marksmen who demand maximum energy transfer on big game without jumping to an oversized, heavy magnum receiver, our 358 Winchester rifle delivers intense terminal performance paired with fast semi-auto cycling speed.

Whether you’re hunting black bear, moose, elk, or thicket-dwelling wild hogs, a semi-automatic 358 Winchester gives you an unbeatable advantage downrange with rapid multi-shot capability and exceptionally smooth cycling.

Billet Precision & Match-Grade Component Assembly

Every 358 Winchester rifle produced in our Roswell, Georgia custom facility is hand-assembled to ultra-tight machining tolerances. We eliminate frame slop, optimize gas pressure delivery, and guarantee reliable mechanical cycling when launching heavy .358 caliber projectiles:

• 18″ 416R Stainless Steel Barrel: Precision cut with 5R rifling and a 1:12 twist rate, this barrel stabilizes heavy 200gr to 250gr 358 Winchester bullets with surgical downrange accuracy. A Tactical Grey Cerakote finish guards the steel against field moisture and abrasion.

• Superlative Arms Adjustable Gas Block: Big-bore AR platforms require precise gas management. Featuring patented forward bleed-off technology, this adjustable block vents excess pressure forward, reducing dirty gas blowback, softening felt recoil, and making suppressor integration seamless.

• HIPERFIRE Match Trigger System: Select your preferred break with a 2.5lb trigger pull—available in single-stage Reflex (curved), Competition (straight shoe), or the X2S Mod3 2-stage configuration for match-grade shot control.

• Odin Adjustable Buffer & Low-Mass BCG: Combined with our HPT/MPI tested low-mass bolt carrier group, the Odin adjustable buffer system absorbs heavy rearward impulse, allowing you to maintain sight alignment for fast follow-up shots.

Technical Specification Matrix

The Ballistic Superiority of the 358 Winchester Cartridge

Created by necking up a standard .308 Winchester case to fire .358-inch caliber bullets, the 358 Winchester is widely recognized as one of the most effective medium-range heavy hunting rounds ever designed. It delivers tremendous energy and massive hydrostatic shock on target, punching clean through heavy bone and thick hide at distances under 300 yards.

By housing the 358 Winchester cartridge in our gas-operated semi-automatic CM10 chassis, you gain the stopping authority of a heavy timber cartridge combined with a soft recoil impulse and rapid follow-up shot execution.

Tailored Factory Options & Suppressor Readiness

Configure your 358 Winchester custom rifle directly at checkout to suit your specific hunting setup:

1. Suppressor-Ready Muzzle Mounts: Equipped standard with top quick-detach options including the SilencerCo ASR Brake, Dead Air Keymo Brake/Flash Hider, Q Cherry Bomb, Rugged Brake/Flash Hider, or Yankee Hill Brake.

2. Match-Grade Trigger Shoes: Choose the classic curved Reflex trigger for gloved hunting hands, the straight Competition shoe for bench precision, or the X2S Mod3 two-stage for extra creep control.

3. B5 Ergonomic Package: Outfitted with a B5 Systems Bravo Stock, B5 Pistol Grip, and M-LOK Rail Covers for an aggressive, tactile hold under wet field conditions.

Helpful Links & Related Products

• Explore the CM10 Lineup: View our complete line of big-bore platforms in the CM10 AR10 Collection, including our CM10 338 Federal Rifle and CM10 7mm-08 Rem Rifle.

• Small-Frame AR Builds: Looking for lighter tactical options? Check out our full line of CM15 Firearms.

• Ammunition & Suppressor Specs: Review factory load details on Winchester Ammunition or explore compatible silencer hosts via the Silencer Shop Network.

Frequently Asked Questions (FAQ)

1. What makes the 358 Winchester ideal for hunting in heavy timber?

The 358 Winchester utilizes heavy, large-diameter .358 bullets (typically 200gr to 250gr) that carry immense momentum downrange. This delivers immediate, devastating knock-down power on large game at short-to-medium ranges, ideal for dense woods and brush environments.

2. Which magazines are compatible with this 358 Winchester rifle?

Because the 358 Winchester shares its parent casing dimensions with the .308 Winchester, it feeds reliably out of standard AR10 / SR25 pattern 7.62x51mm magazines, such as the included 10-round Magpul PMAG.

3. Can I shoot this 358 Winchester rifle suppressed?

Yes! The 18″ 416R stainless barrel features standard 5/8×24 threading and includes a Superlative Arms adjustable gas block. You can select your preferred muzzle host (SilencerCo, Dead Air, Q, Rugged, YHM) directly at checkout to tune for your silencer.

4. What upper and lower receiver pattern is used?

Our CM10 receiver set is CNC machined from 7075-T6 billet aluminum following SR25 pattern dimensions and DPMS High Profile specifications (including 16TPI barrel nut threads) for maximum component compatibility.

5. What is the current production lead time on custom 358 Winchester builds?

Current custom order manufacturing time for the CM10 358 Winchester is approximately 2 weeks from purchase date to shipment to your transferring FFL dealer.