CM10 358 Winchester 18″ AR10 Rifle Cobalt Kinetics Green and Coyote

This is a 358 Winchester AR10 rifle from Chattahoochee Munitions. We have been building in less mainstream calibers since our inception, both in AR and bolt-action platforms. 8.6BLK, 243 Win, 22-250 Rem, 338 Spectre, 400 Legend, 338 Federal, etc. Experience building with various lowers, uppers, and handguards, both in low and high profile, allowed us to weigh all 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 though 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

• Black Tungsten 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 Black Grip

Receiver Extension:

• B5 Systems Bravo Stock – Black

• CM Milspec Buffer Tube – Black Tungsten Cerakote

• QD Endplate

• Odin Adjustable Buffer AR10

Upper:

• CM10 Low Mass Bolt Carrier Group

  • 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 – Black Tungsten Cerakote

  • 6061 Aluminum

  • Dual Taper Attachment System

  • Steel Barrel Nut

  • QD Attachment at 3 and 9 o’clock positions

  • MLOK attachment on sides and bottom

  • Full Picatinny Top Rail

• B5 Systems Black Rail Covers

• Pictured with Silencerco ASR muzzle device; can sub for Rugged, Dead Air Keymo, Yankee Hill, Q Cherry Bomb

Barrel: 358 Winchester Rifle

• CM 358 Winchester 18″ Barrel

• 416R Stainless Steel

• 1:12 Twist

• 5/8×24 thread pitch

• .750 gas journal

• 5R Rifling

• Tactical Grey Cerakote

Magazine:

• 1x10rd PMAG 7.62 Black

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 original purchaser

• Limited regarding functional performance

• Limited regarding original configuration

Dominant Timber Stopping Power: The Custom 358 Winchester AR10

When tracking big game through heavy brush and dense timber, you need a setup that delivers massive terminal force without sacrificing quick follow-up speed. The custom 358 Winchester AR10 from Chattahoochee Munitions bridges the gap between traditional heavy-bore brush cartridges and modern semi-automatic rifle tech. Built on our ultra-rigid CM10 billet chassis, this high-performance rifle brings unmatched knock-down authority to shooters who demand precision engineering and rapid cycling.

Whether you’re taking down moose, black bear, elk, or thicket-bound feral hogs, a custom 358 Winchester AR10 gives you an unmistakable advantage downrange with manageable recoil and rapid multi-shot capability.

Precision Craftsmanship & Premium Engineering

Every 358 Winchester AR10 hand-crafted in our Roswell, Georgia custom workshop is built to exacting specs. We eliminate receiver looseness, optimize gas volume control, and guarantee flawless feeding of heavy .358 caliber projectiles:

• 18″ 416R Stainless Steel 5R Barrel: Featuring a 1:12 twist rate, this barrel stabilizes heavy 200gr to 250gr .358 projectiles for devastating, bone-crushing accuracy. The Tactical Grey Cerakote finish guards the steel against field wear and weather.

• Superlative Arms Adjustable Gas Block: Managing heavy gas volume is critical for big-bore semi-autos. The patented bleed-off design vents excess gas forward away from the shooter, softening felt recoil, minimizing receiver fouling, and optimizing suppressed operation on your 358 Winchester AR10.

• Match-Grade HIPERFIRE Trigger System: Ships with a crisp 2.5lb trigger pull—available in single-stage Reflex (curved), Competition (straight shoe), or the X2S Mod3 2-stage configuration for ultimate control.

• Odin Adjustable Buffer & Low-Mass BCG: Coupled with our low-mass bolt carrier group, the Odin adjustable buffer absorbs rearward impulse, keeping your sight picture steady for lightning-fast follow-ups.

Complete Technical Performance Specifications

The Ballistic Superiority of the 358 Winchester AR10

By necking up a standard .308 Winchester casing to chamber .358-inch diameter bullets, the 358 Winchester AR10 delivers incredible energy transfer and massive hydrostatic shock at short to medium ranges. It punches through thick hide and heavy shoulder bone effortlessly while using standard short-action magazine dimensions.

By housing this heavy-hitting cartridge inside our gas-operated 358 Winchester AR10 platform, the gas system absorbs a massive portion of the rearward recoil impulse, giving you a smooth, highly controllable big-bore firearm.

Custom Factory Options & Suppressor Integration

Select your exact build options directly at checkout to configure your 358 Winchester AR10 for your hunting environment:

1. Suppressor-Ready Muzzle Mounts: Outfitted 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 Trigger Configurations: Select a curved Reflex trigger for gloved hunting hands, a straight Competition shoe for bench precision, or the X2S Mod3 two-stage for extra pull control.

3. B5 Ergonomic Upgrade: Includes a B5 Systems Bravo Stock, B5 Grip, and M-LOK Rail Covers for a tactical, non-slip feel in wet conditions.

Helpful Links & Related Products

• Explore the CM10 Family: Browse our full lineup of big-bore platforms in the CM10 AR10 Collection, including our CM10 338 Federal Rifle and CM10 7mm-08 Rem Rifle.

• Small-Frame Tactical Rifles: Looking for lighter, compact firearms? Check out our full line of CM15 Firearms.

• Ammunition & Suppressor Specs: Review factory reloading data on Winchester Ammunition or browse compatible silencers on the Silencer Shop Network.

Frequently Asked Questions (FAQ)

1. Why choose a 358 Winchester AR10 over a standard bolt-action rifle?

A 358 Winchester AR10 combines the massive downrange knock-down power of a heavy .358 caliber bullet with rapid semi-automatic cycling. Our tuned gas system and adjustable buffer significantly reduce felt recoil compared to a bolt-action, allowing you to stay on target for quick follow-up shots.

2. Which magazines work best with this? 358 Winchester AR10?

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

3. Can I run a suppressor on this 358 Winchester AR10?

Yes! The 18″ 416R stainless barrel is threaded in 5/8×24 pitch and comes equipped with a Superlative Arms adjustable gas block. You can select your preferred muzzle host (SilencerCo, Dead Air, Q, YHM, Rugged) at checkout to easily tune gas pressure for suppressed shooting.

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 manufacturing lead time for a 358 Winchester AR10?

Current custom order production time for the 358 Winchester AR10 is approximately 2 weeks from purchase date to shipment to your transferring FFL dealer.