375 Raptor: The Definitive 12.5″ Lightweight Compact Bolt Action SBR

The 375 Raptor represents a paradigm shift in big-bore ballistics. By necking up the ubiquitous .308 Winchester to .375 caliber, this cartridge delivers staggering energy levels previously reserved for heavy, long-action rifles. At Chattahoochee Munitions, we’ve harnessed this power within our flagship CM7S platform, creating a 12.5″ bolt action SBR that is as agile as it is devastating.

Whether you are a professional guide needing a compact “truck gun” or a precision shooter looking for the ultimate suppressed big-bore experience, this build is engineered to exceed every expectation.

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The Core: CM7S Action – Full PVD Coated

The CM7S action is designed for hunting use, providing the ruggedness needed for the field, but it can also be used for competition, where speed and smoothness are paramount. It is a steel action with a Remington 700-style footprint, ensuring that your investment is compatible with the world’s most popular aftermarket support ecosystem.

The CM7S has several features that factory actions lack, making it the professional choice for those who demand more from their gear:

• Based on the classic Remington 700 footprint with a 3-lug design, this foundation allows for a 60-degree throw, providing massive clearance for optics and enabling lightning-fast follow-up shots.

• M16 style extractor: Known for its legendary reliability, this extractor ensures positive ejection in the most demanding conditions.

• One-piece bolt – 0.718″ Bolt Body DIA: Our heavy-duty, spiral fluted bolt reduces “bolt-flick” and enhances the overall rigidity of the system.

• Wire EDM raceways: We use Electrical Discharge Machining for more uniform tolerances and smoother cycling than traditional milling can offer.

• Full PVD coating: For more corrosion protection and smoother operation, the entire action is PVD treated, resulting in a surface that feels like glass on glass.

Advanced Action Specifications:

• Pinned 20 MOA Picatinny Rail: Ready for long-range holds out of the box.

• Large ejection port and cut-out: Optimized for a light-weight action body, bringing the total action weight to just 25oz.

• .062” firing pin: Specifically designed to accommodate SRP (Small Rifle Primer) brass, perfect for high-pressure 375 Raptor loads.

• Integrated .300” recoil lug: Provides a rock-solid bedding surface for maximum accuracy.

• Tool-less fire control removal: Makes field maintenance effortless.

• Accepts any Remington 700 style trigger: Total customization at your fingertips.

• 1-1/16”-16 thread pitch & Side bolt-stop release: Industry-standard specs with professional-grade convenience.

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Precision Ballistics: CM 375 Raptor 12.5″ Barrel

In collaboration with Mos-Tek, we’ve developed a barrel that maximizes the unique potential of the 375 Raptor cartridge.

• 416R Stainless Steel: High-grade match steel finished in E100 Blackout Cerakote for a stealthy, durable profile.

• 5R rifling: This specialized rifling reduces bullet deformation and fouling, making it easier to clean and inherently more accurate over long strings of fire.

• 1:7 twist rate: A fast twist is essential for the 375 Raptor, allowing it to stabilize heavy subsonic projectiles (up to 400gr) while maintaining pinpoint accuracy with supersonic hunting loads.

• Shouldered crown & 11/16×24 muzzle threads: Perfect concentricity for your muzzle devices or suppressors.

• Remage barrel nut system: Allows for easier maintenance and precise headspace control.

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The CM7 Chassis: Billet Aluminum Performance

To match the precision of the 375 Raptor barreled action, we’ve utilized the CM7 Chassis, machined from a single block of billet aluminum and finished in Cobalt Kinetics Green Cerakote.

• Full Bottom ARCA Rail: Seamlessly mount to any tripod for a rock-solid shooting position in the field.

• Modular Stock Adapter: Our system provides simple single-bolt interchangeability. Whether you choose the Tailhook Pistol brace or the SBR Buttpad, the transition is seamless.

• Ergonomics: Featuring a large trigger guard for gloved operation and an ambidextrous mag release.

• Vertical Crossover Grip: Built in collaboration with MK Machining, providing a natural wrist angle for precision shots.

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Why the 375 Raptor is the Ultimate Hunting Tool

For the modern hunter, the 375 Raptor offers a significant advantage. Traditional cartridges often require long barrels to reach their potential. The Raptor, however, thrives in shorter lengths.

Suppressed Shooting Excellence

 The 375 Raptor’s ability to push heavy lead subsonically makes it a “whisper-quiet” hog hammer.

• Looking for a smaller footprint? Explore our 8.6 Blackout Bolt Action collection.

• Maintain your build with our Bolt Carrier Groups and Spare Barrels.

• New to NFA? Read our guide on Buying NFA Firearms Online.

PLACID OTB Titanium Over-the-Barrel Suppressor System for CM7S

The PLACID OTB is a purpose-built titanium over-the-barrel suppressor system engineered specifically for the Chattahoochee Munitions CM7S bolt-action series of firearms and actions.

Unlike a conventional suppressor that places its entire length and volume forward of the muzzle, the PLACID OTB uses a large-volume reflex suppressor design that extends rearward over the barrel. A specially designed 3D-printed titanium baffle stack vents expanding gases backward into the reflex tube, making the substantial over-the-barrel volume an active part of the suppression system.

The result is not simply a suppressor attached to a CM7S. The PLACID OTB is an integrated suppression system engineered around the rifle itself.

Large-Volume Reflex Suppressor Design

The PLACID OTB begins with a proprietary CM7S barrel nut featuring 1.375×24 HUB outer threads. A 12.5-inch titanium outer tube mounts to the barrel nut and extends forward over the barrel, creating the large reflex chamber that defines the OTB system.

Instead of allowing the area surrounding the barrel to serve merely as unused internal space, the PLACID OTB is designed to actively utilize this volume.

Expanding gases are directed rearward from the baffle stack and into the large over-the-barrel reflex chamber, allowing the 12.5-inch tube surrounding the barrel to function as an integral part of the suppressor’s gas-management system.

This architecture provides substantial internal expansion volume without requiring that the entire suppressor extend forward beyond the muzzle.

3D-Printed Titanium Baffle Stack with Rearward Venting

At the heart of the PLACID OTB is a 6-inch 3D-printed titanium baffle stack specifically engineered for the system.

The baffle assembly indexes against a precision taper mount located at the barrel muzzle threads, providing precise alignment with the bore. External 1.375×24 HUB threads on the baffle assembly interface directly with the titanium outer tube.

More importantly, the baffle stack incorporates rearward gas venting designed to direct expanding gases back into the reflex chamber surrounding the barrel.

This allows the PLACID OTB to combine the gas-management characteristics of its 3D-printed baffle geometry with the substantial expansion volume provided by the over-the-barrel tube.

Rather than treating the reflex section simply as additional suppressor volume, the baffle stack and reflex chamber are designed to function together as a complete suppression system.

Integrated Dual-Interface Architecture

The PLACID OTB uses purpose-designed interfaces at both ends of the system.

At the rear, the 12.5-inch titanium reflex tube mounts to the proprietary CM7S barrel nut through 1.375×24 HUB threads.

At the muzzle, the 3D-printed titanium baffle stack indexes against the barrel’s taper mount while its external HUB threads engage the outer tube.

This architecture integrates the barrel, barrel nut, reflex tube, and baffle assembly into a suppression system specifically designed around the CM7S bolt-action platform.

All-Titanium Construction

The PLACID OTB is constructed entirely from titanium, including its outer tube and 3D-printed baffle assembly.

Despite an overall system length of 18.25 inches, the complete PLACID OTB weighs only 1 lb. 7.6 oz.

Titanium construction provides an excellent combination of low weight, strength, corrosion resistance, and temperature resistance while allowing the PLACID OTB to incorporate the substantial internal volume of a large reflex suppressor without excessive system weight.

Purpose-Built for the CM7S Bolt-Action Platform

The PLACID OTB was developed specifically around the Chattahoochee Munitions CM7S series of bolt-action firearms and actions.

Rather than designing a conventional suppressor and adapting it to the rifle afterward, the PLACID OTB takes advantage of the CM7S architecture to move a significant portion of the suppression system rearward over the barrel.

The combination of a 12.5-inch over-the-barrel reflex tube, rearward-venting 3D-printed titanium baffle stack, taper-indexed muzzle interface, and HUB-threaded barrel nut creates an integrated system in which the rifle and suppressor were designed to work together.

PLACID OTB Specifications

Product: PLACID OTB
Type: Over-the-Barrel / Reflex Suppressor System
Platform: Chattahoochee Munitions CM7S bolt-action firearms and actions
Construction: All Titanium
Overall Length: 18.25″
Diameter: 1.5″
System Weight: 1 lb. 7.6 oz.
Reflex Tube Length: 12.5″
Baffle Stack: 6″ 3D-Printed Titanium
Baffle Design: Rearward Venting into Reflex Chamber
Thread Standard: 1.375×24 HUB
Rear Interface: Proprietary CM7S HUB-Threaded Barrel Nut
Muzzle Interface: Taper-Indexed Baffle Stack

PLACID OTB — Over-the-barrel suppression engineered around the CM7S.

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Detailed Specifications

Component	Feature
Caliber	375 Raptor
Action	CM7S Steel (PVD Coated)
Barrel	12.5″ 416R Stainless (5R Rifling)
Chassis	Billet Aluminum (Cobalt Kinetics Green)
Weight	7lb 14oz
Trigger	TriggerTech Rem 700 Primary
Threads	11/16×24

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375 Raptor Frequently Asked Questions (FAQ)

1. Is the 375 Raptor suitable for large game?

Absolutely. The 375 Raptor is designed to deliver energy levels that far exceed standard intermediate cartridges. It is an excellent choice for elk, bear, and feral hogs, especially at ranges within 300 yards.

2. What is the benefit of the 60-degree bolt throw?

A 60-degree throw is 30% shorter than a standard Remington 700 (90-degree). This allows you to cycle the action faster and keeps the bolt knob further away from your optics, preventing you from hitting your knuckles on the scope’s power ring.

3. Can I shoot subsonic ammo through this 12.5″ barrel?

Yes. The 1:7 twist rate was specifically selected to stabilize the heavy, long bullets required for subsonic performance. It handles both supersonic and subsonic loads with exceptional stability.

4. What makes PVD coating better than standard finishes?

Physical Vapor Deposition (PVD) is an incredibly hard, thin coating. Unlike traditional finishes that can wear or chip, PVD becomes part of the metal surface. It significantly reduces friction, meaning your bolt cycle stays smooth even when the action is dry or dirty.

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Sales Focus: A Legacy of Professionalism

When you invest in a Chattahoochee Munitions 375 Raptor, you are not just buying a firearm—you are buying a handcrafted tool built by professionals. Every CM7S is built to order in Roswell, GA, ensuring that the tolerances are tight and the performance is flawless.

• Limited Lifetime Warranty: We stand behind our work for the original purchaser.

• Customization: Need a different Cerakote color? We offer any single color at no extra charge. Just email us after your purchase.

Add the 375 Raptor to your arsenal today and experience the pinnacle of lightweight, compact, big-bore power.

Stock – Cobalt Kinetics Green Cerakote

SBR – Telescoping Butt Pad with Adjustable Cheek Riser

Grip:

CM Precision Vertical Crossover Grip (in collaboration with MK Machining) (AI Dark Earth Cerakote)

Magazine:

1x10rd Magpul AICS 7.62 (AI Dark Earth Cerakote)

Warranty:

Limited Lifetime Warranty

Limited regarding the original purchaser

Limited in functionality

Dimensions:

Weight: 7lb 14oz

Length: 30.875″ – 37.00″  (Weight and dimensions on other tab are for shipping purposes)

LOP: 6.0″ – 13.5″