CM10 358 Winchester 18″ Rifle AR10 Black Tungsten

358 Winchester Rifle 18″ AR10 | Unstoppable Timber Power

This is a 358 Winchester 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

Dominate Deep Brush & Big Game with the Custom CM10 358 Winchester Rifle

When navigating dense timber or tracking heavy North American big game, standard short-action cartridges often fall short on raw terminal knockdown force. The custom 358 Winchester rifle from Chattahoochee Munitions delivers massive stopping power in a fast-cycling, semi-automatic AR10 platform. Built on our precision-machined CM10 chassis, this high-performance rifle brings heavy-bore timber authority straight to modern marksmen without forcing you to handle a heavy, slow-cycling bolt-action setup.

Whether you’re taking on black bear, bull moose, elk, or trophy-sized wild hogs in tight cover, a custom semi-automatic 358 Winchester rifle gives you an immediate competitive edge downrange with controlled recoil and rapid multi-shot performance.

Precision Craftsmanship & Match-Grade Component Engineering

Every single 358 Winchester rifle hand-assembled in our Roswell, Georgia custom shop is built to ultra-tight machining tolerances. We eliminate frame movement, hand-tune gas delivery, and guarantee reliable mechanical cycling shot after shot:

• 18″ 416R Stainless Steel 5R Barrel: Featuring a 1:12 twist rate, this barrel stabilizes heavy 200gr to 250gr .358 projectiles for surgical downrange placement. The Tactical Grey Cerakote finish shields the steel from harsh moisture and field abrasion.

• Superlative Arms Adjustable Gas Block: Big-bore AR platforms require precise gas management. The patented forward bleed-off system vents excess gas forward away from the shooter, softening felt recoil, reducing dirty blowback, and tuning your 358 Winchester rifle for flawless suppressed performance.

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

• Odin Adjustable Buffer & Low-Mass BCG: Coupled with our HPT/MPI low-mass bolt carrier group, the Odin adjustable buffer absorbs heavy rearward impulse, keeping your sights aligned for rapid follow-ups.

Complete Technical Performance Specifications

The Ballistic Advantages of a Semi-Auto 358 Winchester Rifle

By necking up a standard .308 Winchester case to accept .358-inch caliber projectiles, a 358 Winchester rifle generates massive kinetic energy transfer and heavy hydrostatic shock at short to medium ranges. It punches cleanly through thick shoulder bone and tough hide while using standard short-action magazine dimensions.

By housing this heavy-hitting round in our gas-operated semi-automatic CM10 chassis, your 358 Winchester rifle absorbs a substantial portion of the rearward impulse, giving you big-bore energy paired with smooth AR control.

Custom Factory Options & Suppressor Readiness

Select your exact build parameters directly at checkout to configure your 358 Winchester rifle for your specific hunting style:

1. Suppressor Host Muzzle Devices: 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 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 creep control.

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

Helpful Links & Related Products

• Explore the CM10 Lineup: 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 load data on Winchester Ammunition or browse compatible silencers on the Silencer Shop Network.

Frequently Asked Questions (FAQ)

1. What makes a semi-auto 358 Winchester rifle ideal for brush hunting?

A semi-automatic 358 Winchester rifle fires heavy .358 bullets (200gr to 250gr) that transfer maximum kinetic energy on target. In thick brush or timber where fast target acquisition matters, the semi-auto gas platform lets you stay on target for quick follow-ups without cycling a manual bolt.

2. Which magazines fit this 358 Winchester rifle?

Because the .358 Winchester cartridge shares its parent case dimensions with the .308 Winchester, your 358 Winchester rifle 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 rifle?

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

4. What upper and lower receiver pattern is used for this build?

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 for a custom 358 Winchester rifle?

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