Building the Ultimate Suppressed 300 BLK Fun Gun, The Rossi Brawler Project

At first glance, it’s just a single-shot break-action pistol with a 9-inch threaded barrel. But that simplicity is exactly what makes it special, especially when you suppress it.

• Caliber: .300 Blackout
• Action Type: Break-action, single-shot, hammer-fired (Single Action Only)
• Barrel Length: 9 inches
• Barrel Material: Alloy steel
• Barrel Twist: 1:8 RH
• Grooves: 6
• Muzzle Threading: 5/8×24 (suppressor-ready)
• Overall Length: 14 inches
• Weight (Unloaded): 48.5 oz (3.03 lbs)
• Frame: Polymer with rubber overmold grip
• Optics Rail: 4-inch Picatinny rail on top
• Sights: None (optics-ready only)
• Trigger: Single-action, approximately 4 lb 5 oz pull (some reports as low as ~2.8–4 lbs)
• Safety: Cross-bolt safety
• Finish: Matte black
• MSRP: Approximately $304–$325 (often found for ~$280)

The Brawler has almost no moving parts. You cock the hammer, fire, break it open, reload, and repeat. There’s no gas system, no bolt carrier slamming back and forth, and no noisy cycling action. When you pair it with a good suppressor and subsonic ammo, it becomes one of the quietest .300 BLK hosts you can find. The only real sound is the bullet itself (and even that disappears with good subsonics).

People who have reviewed the Brawler consistently praise its simplicity, reliability, and value. At around $280–$325, it’s one of the most affordable suppressor-ready .300 BLK pistols on the market. Reviewers often call it a “truck gun,” “camp gun,” or “backcountry utility pistol” because it’s lightweight, tough, and easy to throw in a pack.

I decided to lean into that “fun gun” potential and build one out properly.

I started with the base Rossi Brawler in .300 Blackout. It already comes threaded (5/8×24) and has a short Picatinny rail on top, so it was suppressor-ready from the start.

To make it more comfortable and practical, I added a few key upgrades:

Last updated: September 2, 2026 · Originally published July 18, 2026

• Farrow Tech Picatinny/Buffer Tube Adapter: This was a game-changer. It lets me run standard AR grips and gives me the ability to add a stock or brace. It’s well-made (SLS nylon with steel QD points) and requires no permanent modifications to the gun.
• Onyx Precision Mfg. Extended Handguard,  I went with their SLS manufacturing process ARCA/M-LOK version for the .300 BLK model. It adds real estate for a bipod or grip and gives the pistol a much more modern, stable feel. The fit and finish are excellent. (note) Onyx Precision now makes an Aluminum version but I was content with saving some money for the ammo. 
• Strike Industries Dual Folding Stabilizer: I chose Strike’s dual-folding Picatinny stock/brace system. It folds left or right, locks up solid, and gives me options depending on whether I want a true stock or a brace. It’s one of the most versatile folding solutions on the market. I went ahead and registered my Rossi Brawler as an SBR allowing me to choose the stock version. 

Finally, I topped it off with the star of the show: the BANISH 30 GOLD-V2.

The Brawler is already quiet because of its simple action, but the BANISH 30 GOLD-V2 takes it to another level. It’s a high-performance .30 caliber suppressor that pairs perfectly with the .300 BLK. Whether I’m running subsonic ammo for maximum quietness or supersonic loads for a little more reach, the GOLD-V2 keeps things pleasant and hearing-safe.

The whole package now feels like a proper little suppressed pistol. It’s short, relatively light, accurate enough for plinking and small-to-medium game, and ridiculously fun to shoot. Because it’s single-shot, every round feels intentional. You slow down, focus on your shot, and really enjoy the experience, whether you’re ringing steel at the range or quietly hunting hogs or coyotes.

• Caliber Rating: .30 caliber (optimized for .300 Blackout; rated up to .300 Win Mag in most configurations)
• Material: Titanium construction
• Weight: Approximately 10–14 oz (depending on short vs. long configuration)
• Length: Modular design — Short configuration typically ~6.5–7.5 inches
• Diameter: Approximately 1.5–1.6 inches
• Sound Reduction: 30+ dB (excellent suppression, especially with subsonic .300 BLK)
• Mounting System: Industry standard HUB mount compatible (direct thread options available)
• Baffles: Multi-baffle design (user-serviceable in most BANISH 30 models)
• Full-Auto Rated: No (rated for semi-automatic and bolt-action use)
• Finish: Cerakote (often black or with gold accents on GOLD-V2 models)
• Warranty: Lifetime warranty
• Key Features: Lightweight titanium design, excellent sound and recoil reduction, modular length options

Most people start the project for these main reasons:

• Extremely affordable base gun — At $280–$325, it’s one of the cheapest suppressor-ready .300 BLK platforms available. People see it as a low-risk way to build something fun and unique.
• Suppressor host potential — The 9″ threaded barrel makes it an instant suppressor host. Many buyers specifically wanted a quiet .300 BLK pistol without spending $1,000+ on an AR platform.
• Simplicity and reliability — The break-action, single-shot design has almost no moving parts. Users like that it’s “bombproof” and easy to maintain.
• Fun factor — A lot of people describe it as a “silly but awesome” gun. They wanted something different from another AR build.

What People Like After Customizing It

What I love most about this project is how well everything complements each other:

• The Rossi Brawler gives you an affordable, reliable, suppressor-ready base.
• The Farrow Tech adapter and Onyx handguard modernize the ergonomics.
• The Strike Industries (or A3) stock/brace makes it actually comfortable to shoot.
• The BANISH 30 GOLD-V2 turns the whole thing into a whisper-quiet plinker and hunter.

It’s not the fanciest or most expensive build out there, but it might be one of the most enjoyable. There’s something special about a simple, single-shot suppressed .300 BLK that just works and puts a smile on your face every time you shoot it.

Sometimes the best guns aren’t the most complicated ones. Sometimes they’re the simple ones you actually shoot, and enjoy,  the most.