400 Legend Semi Auto Rifle — CM15 16″ Black Tungsten
The Chattahoochee Munitions CM15 400 Legend Semi Auto Rifle combines a straight-wall hunting cartridge with a 16-inch barrel, ambidextrous controls, and Black Tungsten Cerakote. Black B5 Systems furniture completes the configuration, while a TriggerTech Duty trigger, ODIN adjustable buffer, and Superlative Arms adjustable gas block are standard equipment.
Explore this rifle within Hall of Legends, our destination for 350 Legend and 400 Legend systems. The hub connects complete CM15 rifles, dedicated magazines, uppers, and educational resources so you can evaluate the cartridge and platform together.
Understanding the 400 Legend Cartridge
Winchester introduced 400 Legend as a straight-wall cartridge for hunting and sport shooting. Its intended hunting applications include deer, hogs, and black bear. Our 400 Legend Guide explains the cartridge’s background, hunting ammunition, published ballistics, and CM15 configuration.
Choosing a hunting load requires more than comparing muzzle-energy figures. Bullet construction, velocity, trajectory, and the conditions of your hunt all matter. Published ammunition data should be read alongside its test-barrel length; figures from a different barrel are not measured results from this 16-inch CM15. Winchester’s introduction of the 400 Legend provides manufacturer background and the basis for its original cartridge comparisons.
For context alongside a familiar hunting option, read our 400 Legend vs 44 Magnum comparison. It examines rifle ammunition, trajectory considerations, and platform differences to help you evaluate each combination.
16-Inch Stainless Barrel and Midlength Gas System
This 400 Legend Semi Auto Rifle uses a 16-inch 416R stainless-steel barrel with a black nitrided finish, 1:16 twist, and 5R rifling. The barrel has a .875-inch gas-block journal and 11/16×24 muzzle threads. A midlength gas system completes the specified barrel configuration.
The 15-inch low-profile handguard provides space for support-hand placement, sling attachments, and accessories while leaving the muzzle device exposed. Barrel length, gas-system length, and muzzle threading are specific to this 400 Legend configuration and differ from our 18-inch 350 Legend rifles.
- Chambering: .400 Legend
- Barrel length: 16 inches
- Material: 416R stainless steel
- Finish: Black nitrided
- Twist rate: 1:16
- Rifling: 5R
- Gas-block journal: .875 inch
- Muzzle threads: 11/16×24
- Gas system: Midlength
TriggerTech Duty Trigger — Three Options
Every Chattahoochee Munitions CM10 and CM15 uses a TriggerTech Duty trigger. For this 400 Legend Semi Auto Rifle, choose a single-stage straight, single-stage curved, or two-stage straight configuration. All three options have a total pull weight of 3.5 pounds.
A single-stage trigger presents one stage of pull before the break. A two-stage trigger provides an initial take-up stage followed by a distinct second stage before the break. Straight and curved profiles offer different finger-contact shapes, allowing you to select the trigger configuration that suits your preferences.
- Single-stage straight: 3.5-pound total pull weight
- Single-stage curved: 3.5-pound total pull weight
- Two-stage straight: 3.5-pound total pull weight
TriggerTech’s single-stage Duty and two-stage Duty pages explain the manufacturer’s designs. The three options offered on this CM15 are specified at 3.5 pounds total pull weight.
Ambidextrous Controls and Charging Handle
The controls on this 400 Legend Semi Auto Rifle include an ambidextrous safety, magazine release, and bolt release. Access from either side of the receiver is complemented by the CM15 Warhammer ambidextrous charging handle, manufactured in collaboration with Breek Arms from 7075 aluminum.
- Chattahoochee Munitions ambidextrous safety
- Chattahoochee Munitions ambidextrous magazine release
- CM15 ambidextrous bolt release
- CM15 pivot and takedown pins
- TriggerTech Duty trigger in the selected configuration
- B5 Systems black grip
- CM15 Warhammer ambidextrous charging handle
Adjustable Gas and Buffer Components
A Superlative Arms .875 adjustable gas block and ODIN adjustable AR15 buffer are standard on this 400 Legend Semi Auto Rifle. They provide adjustment capability within the operating system: the gas block controls the gas supplied to the action, and the buffer provides selectable weight combinations. ODIN describes its interchangeable-weight design on the adjustable buffer product page.
The upper includes a Melonite-finished midlength gas tube, CM15 dust cover, and forward assist. Chattahoochee Munitions recommends flow-through suppressors for this Legend CM15 configuration. Suppressor selection must account for .400 Legend suitability, bore clearance, and compatibility with the muzzle device and mounting system.
CM15 400 Legend Bolt Carrier Group
- Mil-Spec 9310 steel bolt
- High-pressure-tested and magnetic-particle-inspected bolt
- Nitride-coated bolt, carrier, and gas key
- Gas key hardened to USGI specifications
- Grade 8 hardened gas-key fasteners, staked per Mil-Spec
- Tool-steel extractor
Billet Receivers and Black Tungsten Cerakote
The upper and lower receivers of this 400 Legend Semi Auto Rifle are CNC machined from 7075-T6 billet aluminum. Black Tungsten Cerakote is applied to the receivers, handguard, and buffer tube, with black furniture completing the exterior.
The lower incorporates an integral trigger guard and a machined, widely flared magazine well. Fire and Safe pictograms appear on both sides to accompany the ambidextrous controls.
- AR15-pattern Mil-Spec interface dimensions
- CNC-machined 7075-T6 billet aluminum construction
- Lightweight fire-control-group faces and magazine-well design
- Integral trigger guard
- Machined rather than broached magazine well with wide flare
- Lower receiver weight: 8.0 ounces
- Receiver finish: Black Tungsten Cerakote
Handguard, Stock, and Rifle Fit
The CM15 LWS Low Profile 15-inch handguard on this 400 Legend Semi Auto Rifle offers a full Picatinny top rail with M-LOK attachment points along the sides and bottom. QD positions at 3 and 9 o’clock provide sling-attachment options, and B5 Systems black rail covers complete the handguard configuration.
- Handguard: CM15 LWS Low Profile, 15 inches
- Finish: Black Tungsten Cerakote
- Material: 6061 aluminum
- Dual Taper Attachment System with steel barrel nut
- QD attachment positions at 3 and 9 o’clock
- M-LOK attachment points on the sides and bottom
- Full Picatinny top rail
- B5 Systems black rail covers
The black B5 Systems Bravo stock provides an adjustable length of pull from 11.50 to 14.75 inches. Stock adjustment helps accommodate shooting position and clothing layers. The Mil-Spec buffer tube receives matching Black Tungsten Cerakote, and the QD endplate supplies another sling-attachment location.
- Stock: B5 Systems Bravo, black
- Buffer tube: Chattahoochee Munitions Mil-Spec, Black Tungsten Cerakote
- Endplate: QD
- Buffer: ODIN adjustable AR15
- Overall length: 33.25–36.50 inches
- Length of pull: 11.50–14.75 inches
- Weight: 6 pounds, 14 ounces with an unloaded magazine and no accessories
Weight and dimensions shown in the shipping information tab are for shipping purposes.
Muzzle Device and Magazine
A Chattahoochee Munitions 11/16×24 muzzle device is included. Contact us for availability and pricing adjustments on other requested muzzle devices. Thread pitch alone does not establish compatibility; the selected device must also provide appropriate bore clearance for .400 Legend.
The rifle includes one black 10-round DURAMAG 400 Legend magazine. Select magazines intended for this chambering. Additional 400 Legend magazines are available directly from Chattahoochee Munitions.
Choosing Your 400 Legend Semi Auto Rifle
This 400 Legend Semi Auto Rifle combines the Black Tungsten finish with black furniture, a 16-inch stainless barrel, and your choice of TriggerTech Duty trigger. Explore Hall of Legends to compare the available CM15 configurations and learn more about both Legend cartridges.
Before hunting, check the current requirements for your location and season, including permitted cartridges, firearm types, and magazine capacity.
Limited Lifetime Warranty
The Chattahoochee Munitions limited lifetime warranty applies to the original purchaser and is limited to functional performance in the firearm’s original configuration. See our warranty information for details.
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