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APA Gen 4 Fat Bastard Self Timing Brake 5/8×24 .30 Cal Stainless

UPC: 810131791483

$210.99

7 in stock

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Description

American Precision Arms went back to the drawing board with the Gen 4 Fat Bastard, and it shows. This .30 caliber version threads 5/8"x24 and comes in a stainless finish, measuring 3.30" long with a 1.10" diameter body. That larger profile gives the internal manifold room to work, which is exactly what you want when you're running heavy hitters. It's rated for barrels between .850" and 1.125", so it pairs naturally with match and heavy contour barrels.

What Sets the Gen 4 Fat Bastard Apart

The headline here is the calibrated U.R.P. tunable top ports. APA spent time testing port size, placement, and how gas feeds through them, and the payoff is the ability to tune out vertical muzzle movement almost entirely. You get to fine tune the brake to your specific rifle and load rather than settling for whatever the factory port config gives you. On the install side, no Thread-tite is needed in the top ports, and there's a caliber and level line machined right into the brake face to make setup straightforward.

Dialing In Recoil With the Fat Bastard

APA chased two goals with the Gen 4: the flattest shooting brake they could build, and lower concussion without giving up recoil reduction. Borrowing from the idea that sound shapes how recoil actually feels, the redesigned Bastard port and internal manifold produce a smoother, lower frequency impulse. The result is a rifle that's easier on the ears and easier to keep on target through the shot. Folks running these on 300 Win Mag and other magnums consistently report they stay planted and can spot their own impacts.

The self timing system is the other big draw. There are no shims or crush washers to fuss with, so the brake indexes true every time you thread it on. This .30 caliber model covers any cartridge with a .308" bullet or smaller, including 270 Winchester, 7mm Rem Mag, 7.62x51mm, 30-06 Springfield, 300 PRC, and 300 Win Mag. Every one is machined in APA's facility in Jefferson, Georgia.

Key Specifications

  • Manufacturer: American Precision Arms
  • Model: Gen 4 Fat Bastard Self Timing
  • Manufacturer Part Number: G4F5830S
  • UPC: 810131791483
  • Caliber: .30 Cal (.308" bullet or smaller)
  • Thread Pattern: 5/8"x24
  • Overall Length: 3.30"
  • Diameter: 1.10"
  • Finish: Stainless
  • Barrel Fit Range: .850" to 1.125"
  • Timing: Self Timing (no shims or crush washers)
  • Design Features: Tunable U.R.P. top ports, caliber and level line on face
  • Country of Manufacture: Made in Jefferson, GA USA

What’s Included

  • Gen 4 Fat Bastard Self Timing Muzzle Brake
  • Installation and tuning instructions

Frequently Asked Questions

What calibers does the .30 cal Gen 4 Fat Bastard work with?

This version is built for any cartridge using a .308" diameter bullet or smaller. That covers popular choices like 308 Winchester, 30-06 Springfield, 270 Winchester, 7mm Rem Mag, 7.62x51mm, 28 Nosler, 300 PRC, and 300 Win Mag. It handles magnum pressures without issue, which is a big reason folks reach for the Fat Bastard on hard recoiling builds.

Do I need shims or a crush washer to install the Fat Bastard?

No. The self timing design lets the brake index correctly every time you thread it on, so there are no shims or crush washers involved. Most shooters have it mounted and level in just a few minutes, and there's a level line machined into the face to help you confirm alignment.

How do the tunable top ports actually work?

The calibrated U.R.P. top ports let you adjust how gas exits the top of the brake, which controls vertical muzzle movement. By opening or closing them to match your rifle and load, you can dial the muzzle to sit flat through the shot. No Thread-tite is required in the top ports, so tuning stays simple and repeatable.

Will the Gen 4 Fat Bastard fit my barrel contour?

It's designed for barrels ranging from .850" up to 1.125" at the muzzle, which makes it a solid match for match and heavy contour barrels. The 1.10" brake body blends cleanly against thicker profiles. If you're running a thinner sporter barrel, APA's Little Bastard is worth a look since it's sized for narrower contours.

Additional information

UPC

810131791483

Manufacturer

Manufacturer Part Number

G4F5830S

Model

Thread Pattern

5/8"x24

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