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American Precision Arms didn't just tweak an old design when they built the Gen 4 line, they went back to the drawing board on port geometry, gas flow, and even how sound frequency affects felt recoil. The Fat Bastard sits at the top of their lineup for a reason. It's a big, aggressive brake meant for barrels between .8 and 1.1 inches at the muzzle, and it's rated to handle magnum cartridges without breaking a sweat. This nitride version in 6.5mm is bored for any bullet up to .264 inch, so it covers 6.5 Creedmoor, 260 Remington, and similar cartridges running through a 5/8×24 threaded muzzle.
The calibrated URP top ports on this Gen 4 Fat Bastard are fully tunable, which means you're not stuck with whatever vertical performance the brake ships with. APA spent a lot of time testing port size, placement, and gas feed angles to get these ports to essentially cancel out vertical muzzle movement. Pair that with the redesigned Bastard port on the sides, and you get a brake that cuts recoil hard while keeping the concussion down, something APA figured out by looking at how sound frequency changes the way recoil actually feels to the guy behind the trigger.
This brake uses APA's self-timing lock nut system, so there's no need to have a barrel faced or shimmed to get everything indexed at 12 o'clock. You thread it on, get it level, and cinch down the nut. No crush washers, no peel washers, no trip to the smith. That also makes it painless to pull the brake for cleaning or to swap it to a different rifle down the road, which matters if you're the type who runs through more than one barrel in a season.
This version comes in a black nitride finish over steel, which holds up well to carbon buildup and everyday range abuse while giving the brake a tougher look than bare stainless. At 3.30 inches long, 1.10 inches in diameter, and 6.4 ounces, it adds a bit of heft and reach out front, which helps with muzzle control on top of the port work doing the heavy lifting on recoil. Every one of these is machined at APA's shop in Jefferson, Georgia.
No, that's the whole point of the self-timing design. You thread the brake onto your barrel, rotate it until the ports line up level, and tighten the lock nut down by hand or with a wrench. There's no facing, shimming, or indexing work required like you'd need with a traditional fixed brake.
Yes, the 6.5mm bore is sized for any cartridge shooting a .264 inch diameter bullet or smaller, which covers 6.5 Creedmoor, 260 Remington, and similar rounds. It's not caliber specific in the sense of case size, it's about matching bullet diameter to the bore.
The URP top ports let you fine tune gas escape to counteract muzzle rise for your specific rifle, load, and barrel contour. APA built these to get as close to zero vertical movement as possible, which is a step up from earlier generations that offered less adjustment.
Nitride creates a hardened black surface that resists wear and corrosion well under normal range and field use, and it tends to be easier to keep clean since carbon doesn't stick to it as stubbornly. Stainless is still a great choice if you want a brighter finish, but nitride gives you a tougher, low maintenance black look that matches most modern rifle builds.
| UPC | 810131791452 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | G4F5865N |
| Model | |
| Thread Pattern | 5/8"x24 |
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