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Chattahoochee Munitions manufactures the PLACID 375, a 375 suppressor with a fully welded 17-4 stainless steel body, 11 baffles and a 1.375×24 HUB mounting interface. It ships with an 11/16×24 titanium direct-thread mount and a titanium .375 end cap, and it is rated for centerfire rifle cartridges from 5.56 NATO through .375 Magnum. It is the direct-thread member of the PLACID Suppression line, alongside the PLACID OTB over the barrel suppressor.
The PLACID 375 is designed first for the 375 Raptor, the cartridge designed by Arne Brennan that Chattahoochee Munitions manufactures in CM7S bolt action and CM10 semi-automatic firearms. See every configuration in the Raptor Paddock.
Why Choose the PLACID 375
The PLACID 375 is defined by published specifications rather than claimed sound levels: a welded stainless body, 11 baffles, 8.25 inches of length, 1.5 inches of diameter and 16.9 oz of weight. It is an enclosed suppressor, which is what Chattahoochee Munitions recommends for every bolt action and for semi-autos shooting subsonic ammunition. With the 400 gr 375 Raptor subsonic load, the bullet stays below the speed of sound, so the suppressor handles muzzle blast without a supersonic crack downrange.
375 Suppressor Construction
The body is fully welded 17-4 stainless steel with 11 baffles inside. The included direct-thread mount and the .375 end cap are titanium. Chattahoochee Munitions does not make universal claims about sound reduction, recoil reduction, accuracy or service life for this 375 suppressor, because those results depend on the complete firearm, ammunition and mounting configuration. Read titanium vs stainless suppressor for how the materials compare.
Direct Thread and 1.375×24 HUB Mounting
The PLACID 375 uses the 1.375×24 HUB interface. The included 11/16×24 titanium mount threads it directly onto an 11/16×24 muzzle, such as the 375 Raptor barrels on the CM7S 375 Raptor. Other HUB-pattern mounts fit the same interface. If you choose another mount, confirm it is correct for the firearm, cartridge and configuration. Read direct thread vs HUB mount.
Caliber Rating: 5.56 NATO Through .375 Magnum
This 375 suppressor is rated for centerfire rifle cartridges from 5.56 NATO through .375 Magnum. Bore diameter alone does not decide compatibility: the firearm, cartridge, barrel, mount and complete configuration all have to suit the suppressor. The PLACID 375 is not rated for 458 SOCOM; for that cartridge, see the 458 SOCOM firearms with PLACID OTB on Terminal 458.
Using the PLACID 375 on 375 Raptor
On a CM7S bolt action, the PLACID 375 pairs with both subsonic and supersonic 375 Raptor ammunition, because a bolt action adds no action noise. On a CM10 semi-auto, use it with subsonic ammunition; with supersonic ammunition in a semi-auto, Chattahoochee Munitions recommends a flow-through suppressor. This is a recommendation, not a compatibility claim. Read the 375 Raptor suppressor guide and 375 Raptor subsonic for more detail.
A suppressor reduces the muzzle blast of expanding propellant gas. A supersonic bullet still makes its own crack in flight, and no suppressed firearm is silent, so wear hearing protection.
Size, Weight and Handling
At 8.25 inches and 16.9 oz, the PLACID 375 sits entirely forward of the muzzle and adds that length and weight to the firearm. On a 12.5-inch CM7S it keeps the rifle compact. If you want a 12.5-inch bolt action with most of the suppressor wrapped around the barrel instead, see the 375 Raptor suppressed SBR with PLACID OTB.
NFA Requirements
Suppressors are regulated under the National Firearms Act, and requirements have changed recently. Check current ATF National Firearms Act guidance and your state law, and see NFA Firearms.
PLACID 375 Specifications
- Manufacturer: Chattahoochee Munitions
- Type: Direct-thread 375 suppressor, enclosed baffle design
- Caliber rating: 5.56 NATO through .375 Magnum
- Body: Fully welded 17-4 stainless steel
- Baffles: 11
- Length: 8.25 inches
- Diameter: 1.5 inches
- Weight: 16.9 oz
- Mounting interface: 1.375×24 HUB
- Included mount: 11/16×24 titanium direct thread
- Included end cap: Titanium, .375
- Finish: Black, Black Tungsten, Cobalt Kinetics Green Cerakote, FDE Metallic, Coyote or Raw; select when you order
What Comes with the PLACID 375
- PLACID 375 fully welded suppressor
- 11/16×24 titanium direct-thread mount
- Titanium .375 end cap
PLACID Suppression Guides
- PLACID Suppression
- Reflex suppressor
- Direct thread vs HUB mount
- Titanium vs stainless suppressor
- Suppressed bolt action rifle
- 375 Raptor suppressor guide
PLACID 375 Suppressor FAQ
Who makes the PLACID 375 suppressor?
Chattahoochee Munitions, a veteran-owned firearm manufacturer in Roswell, Georgia, manufactures the PLACID 375 and the PLACID OTB.
Is the PLACID 375 a 375 suppressor?
Yes. It has a .375 end cap and is rated through .375 Magnum, and it can be used with compatible smaller cartridges within its rating.
What calibers is it rated for?
Centerfire rifle cartridges from 5.56 NATO through .375 Magnum.
Can I use it on 458 SOCOM?
No. 458 SOCOM is larger than its .375 rating. Chattahoochee Munitions offers 458 SOCOM firearms with the PLACID OTB instead.
Is the PLACID 375 HUB compatible?
Yes. It uses the 1.375×24 HUB interface.
What mount comes with it?
An 11/16×24 titanium direct-thread mount, plus a titanium .375 end cap.
Is it enclosed or flow-through?
Enclosed. Chattahoochee Munitions recommends an enclosed suppressor for every bolt action and for semi-autos with subsonic ammunition.
How much does it weigh, and how long is it?
It weighs 16.9 oz and measures 8.25 inches long and 1.5 inches in diameter.
What is it made of?
The body is fully welded 17-4 stainless steel. The included mount and end cap are titanium.
Does it improve accuracy or reduce recoil?
Chattahoochee Munitions makes no universal accuracy or recoil claim. Results depend on the firearm, ammunition, suppressor and mounting configuration.
Nolan H. (verified owner) –