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The American Precision Arms Gen 2 Fat Bastard is a self-timing muzzle brake built to wrangle the recoil that comes with heavy hitters like the .338 Lapua Magnum. Machined from high-grade stainless steel and finished in black nitride, it measures 3.30 inches long with a 1.115 inch diameter, so it has the mass and porting to soak up serious recoil where a smaller brake would come up short. If you shoot big bores and want to stay behind the glass through the shot, this is the kind of brake that earns its keep at the bench and in the field.
The big story with the Gen 2 line is the separate timing nut. Instead of fighting crush washers or peel shims to get the brake clocked straight, you thread the nut on first, run the brake down to spec, and lock it in place. Most people have it done in about half a minute on the kitchen table. That same design lets you pull the brake for cleaning or swap it between barrels without a trip to the gunsmith, which is a real perk for anyone burning through barrels over a season.
Shooters who run the Fat Bastard consistently point to how much it flattens out recoil on big magnums. The wide body and aggressive porting redirect gas to keep the rifle settled, so your sight picture stays put and you can spot your own impacts. It's a big brake by design, which is exactly what the .338-class cartridges need to behave.
This model comes with 5/8-24 threads, the common pattern for larger caliber barrels, and it's meant for the heavier barrel contours those cartridges usually wear. The black nitride finish adds a hard, corrosion-resistant surface over the stainless base and gives it a clean, low-glare look. A quick note from the maker: skip citric-acid cleaners like CLR or Lemishine when it's time to clean the ports, since those can damage the finish. Regular carbon removal keeps it running right and your point of impact honest.
This brake is built for .338 caliber and smaller, and it really shines on big magnums like the .338 Lapua that produce heavy recoil. The wide body and porting are sized for the larger barrel contours those cartridges typically use. It's a big brake by design, so it's more than most .30-caliber shooters need but ideal for the heavy hitters.
No, that's the whole point of the Gen 2 self-timing design. The timing nut is a separate piece, so you thread the nut on, run the brake to spec, and lock it straight without crush washers or peel shims. Most folks get it done at home in about 30 seconds with basic tools, assuming your barrel is already threaded 5/8-24.
It comes with 5/8-24 threads, which is the standard pattern for larger caliber and magnum barrels. Make sure your barrel is threaded to match before ordering. If your barrel uses a different pitch, you'll need it re-threaded or a different brake.
Stick to standard carbon-removal methods and avoid citric-acid-based cleaners like CLR or Lemishine, since those can harm the nitride finish. Carbon builds up in the ports over time, especially the last port, so routine cleaning keeps it functioning and protects your point of impact. Pulling the brake off for a thorough clean is easy thanks to the removable nut design.
| UPC | 810131790875 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | G2F5838N |
| Model | |
| Thread Pattern | 5/8"x24 |
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