CM10 338 Federal AR10 18″ Rifle Black Tungsten and Black

This is a 338 Federal AR10 rifle from Chattahoochee Munitions. We have been building in less-mainstream calibers since our inception, on both 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 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 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: 338 Federal Rifle

• CM 338 Federal 18″ Barrel

• 416R Stainless Steel

• 1:10 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

Unrivaled Big-Game Dominance with the CM10 338 Federal AR10

When hunting large, tough game in dense timber or rugged country, standard cartridges often compromise on raw stopping power. The custom 338 Federal AR10 from Chattahoochee Munitions delivers maximum hard-hitting energy in a fast-cycling, semi-automatic package. Built on our custom-machined CM10 chassis, this high-performance rifle brings big-bore knock-down force directly to the semi-auto shooter without forcing you to carry a heavy, oversized magnum platform.

Whether you’re targeting elk, moose, or big black bears, a custom-tuned 338 Federal AR10 offers exceptional terminal ballistics combined with instantaneous follow-up shot execution.

Billet Precision & Match-Grade Component Engineering

Every 338 Federal AR10 built in our Roswell, Georgia custom shop is hand-assembled to ultra-tight tolerances. We eliminate upper-to-lower play, optimize cycling impulse, and guarantee rock-solid reliability with every round:

• 18″ 416R Stainless Steel 5R Barrel: Featuring a 1:10 twist rate, this barrel stabilizes heavy .338 caliber bullets with absolute surgical precision. The Tactical Grey Cerakote finish guards against harsh weather and field abrasion.

• Superlative Arms Adjustable Gas Block: Managing heavy gas pressure is critical for large-caliber semi-autos. The patented forward bleed-off system reduces gas blowback, softens felt recoil, and makes running a silencer on your 338 Federal AR10 exceptionally clean.

• HIPERFIRE Match Trigger Options: Choose between a 2.5lb Reflex single-stage (curved), Competition single-stage (straight shoe), or X2S Mod3 2-stage trigger for an exceptionally crisp break and lightning-fast reset.

• Odin Adjustable Buffer & Low-Mass BCG: Coupled with our low-mass bolt carrier group, the adjustable buffer absorbs heavy rearward inertia, keeping your sights tracking straight on target for fast follow-ups.

Complete Technical Performance Specifications

Specification	Custom Build Details & Component Standards
Primary Caliber	.338 Federal
Platform Model	Custom CM10 (338 Federal AR10)
Receiver Specs	CNC Machined 7075-T6 Billet Aluminum (DPMS High Spec)
Barrel Profile & Material	18″ 416R Stainless Steel with 5R Rifling, 1:10 Twist
Muzzle Threading	5/8×24 Thread Pitch (Selectable Quick-Detach Brakes)
Receiver Coating	Black Tungsten Cerakote Finish
Trigger Configuration	2.5lb HIPERFIRE (Reflex, Competition, or X2S Mod3 2-Stage)
Handguard System	15″ CM10 LWS M-LOK Handguard with Full Top Rail
Gas System Type	Rifle-Length with Superlative Arms Adjustable Gas Block
Unloaded Weight	7 lbs 14 oz (Without optic or mounted accessories)

The Ballistic Advantages of the 338 Federal AR10

By necking up a standard .308 Winchester case to hold .338 diameter projectiles, the 338 Federal AR10 generates significantly higher kinetic energy than a standard .308 Win out to 400 yards while utilizing the exact same short-action magazine well. The result is massive energy transfer, deep penetration, and high hydrostatic shock.

Building this caliber into a gas-operated 338 Federal AR10 platform smooths out the heavy recoil pulse of the .338 round, giving you a remarkably controllable big-bore semi-auto rifle.

Custom Factory Options & Suppressor Readiness

Customize your 338 Federal AR10 build at checkout to fit your exact shooting style and accessories:

1. Suppressor-Ready Muzzle Devices: 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 classic hunting ergonomics, a straight Competition shoe for bench precision, or the X2S Mod3 two-stage for additional control.

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

Helpful Links & Related Products

• Explore the CM10 Lineup: Browse our complete line of big-bore rifles in the CM10 AR10 Collection, including our CM10 308 Win Rifle and CM10 7mm-08 Rem Rifle.

• Small-Frame Tactical Rifles: Check out our full line of compact CM15 Firearms.

• Ammunition & Suppressor Specs: Review ballistics data on Federal Premium Ammunition or browse compatible silencers on the Silencer Shop Network.

Frequently Asked Questions (FAQ)

1. Why choose a 338 Federal AR10 over a bolt-action rifle?

A 338 Federal AR10 combines the massive terminal shock of a .338 caliber bullet with rapid semi-automatic cycling. This allows you to stay on target and make lightning-fast follow-up shots on big game without breaking your sight picture or working a manual bolt.

2. Which magazines fit this 338 Federal AR10?

Because the .338 Federal cartridge uses the parent casing of the .308 Winchester, your 338 Federal AR10 feeds reliably out of standard AR10 / SR25 pattern 7.62x51mm magazines, such as the included 10-round Magpul PMAG.

3. Can I run a silencer on this 338 Federal AR10?

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 device 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 338 Federal AR10?

Current custom order build time for the 338 Federal AR10 is approximately 2 weeks from the purchase date to shipment to your transferring FFL dealer.