Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.

Enjoy our FREE RETURNS

We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.

Shopping Cart
Special offer available for this product. Click here to see!
Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
Questions & Answers
Will this fit a scar 17? Manufacturer Answer

The correct brake for a Scar 17 would be a Gen 4 Micro.

by American Precision Arms, Manufacturer, September 24, 2025
Customer Reviews
Most Recent Reviews
Muzzle break by Bert, Verified Owner, June 25, 2026
Works as advertised. Easy to tune and install. When you get it you might as well take all the screws out or at least all but the back row to start.
Most Recent Reviews
Muzzle break for 7mm PRC by CSM CSG, Verified Owner, June 24, 2026
A friend recently introduced me to long range shooting with his build in .300 R.U.M. Knowing that rounds reputation and having had three shoulder surgeries, i was hesitant. He assured me that the APA “Fat B^$tard” muzzle break on it tamed the recoil,...
Read More...
Most Recent Reviews
THE BEST purchase I ever made by Stephan, Verified Owner, May 4, 2026
Got this masterpiece for my savage 110 carbon hunter in 7mm prc , i did a lot of research and ended up getting APA muzzle brake , and it was the right choice, easy installation, easy adjustment. On the range after a shot you will hear how load the c...
Read More...
Read All 3 Reviews

Free Express Shipping!

Free Two Day Shipping
Select Two-Day Shipping and use coupon code 2DAYAIRClick to Copy Coupon Code during checkout to get a free shipping upgrade if eligible!
Show In Stock Only
6 Models Available

Show with deals only:

Free 2 Day Shipping
Finish
All
Caliber
All
Search
Click to select this item for your bundle offer!

  • Select a specific model above to see the deal!
  • Heresy Design Silencer Timing Device, 1/2in Threads, Black, HSTDA
As low as $223.95
You Save Up to 20%
OP Bucks$4.48

Product Info for American Precision Arms Gen 4 Fat Bastard Self Timing Muzzle Brake

APA is proud to introduce the Gen 4 Fat Bastard. The Gen 4 is a culmination of engineering improvements as well as a little bit of what you asked, we listened. As the long-range precision rifle community grows, the shooter has gotten more refined and discriminating. This has presented us here at APA with new challenges to improve.image

Our goal for the last year in developing the 4th generation was two-fold; one to make the flattest shooting brake on the market and two, to create a lower concussion maximum recoil reduction product. We are happy to announce that we did it!

The new calibrated U.R.P tunable top ports have been designed for maximum adjustment making the Gen 4 line of brakes the flattest shooting brakes available hands down. By testing port size, location, and how the gas feeds into them, we have been able to make these tunable top ports capable of generating zero vertical movement.

The new fine-tuned Bastard port has been engineered to decrease concussion while retaining maximum recoil reduction. In the muzzle brake community, there is an unwritten law that says more concussion, more recoil reduction and vice versa. This is something we really dug into, and we have found this to simply be not true. Borrowing from decades of research in the golf industry with their sound is feel philosophy, we wanted to figure out why a technically more effective and superior muzzle brakes would often anecdotally feel harsher even though the gun moved less and moved slower. Well, we had a eureka moment with how the sound or tone works in conjunction with the physical recoil. The new fine-tuned Bastard port and internal manifold produce a softer and sonically smoother recoil impulse by shaping the sound, into a lower frequency. The perception to the shooter is a much softer shooting rifle. This brake is easier on the ears and easier to stay in target, period.

Although the DNA remains the same, the new Generation 4 Fat Bastard Self-Timing Muzzle Brake is a completely new beast. It is flatter shooting, softer recoiling, more tunable, and easier to use than ever.

Specifications for American Precision Arms Gen 4 Fat Bastard Self Timing Muzzle Brake:

Manufacturer: American Precision Arms
Fabric/Material: Stainless Steel
Threads per Inch: 5/8x24
Model Generation: 4
Inner Diameter: 1.1 in
Outer Diameter: 1.1 in
Length: 3.3 in
Weight: 6.4 oz
Condition: New

Features of American Precision Arms Gen 4 Fat Bastard Self Timing Muzzle Brake:

  • New optimally tuned top ports for maximum efficacy and tunability.
  • New port design and internal manifold that is more efficient, and softer sounding.
  • Caliber and level line machined on brake face.
  • No Thread-title necessary in top ports.
  • Completely machined in our facility in Jefferson GA

Package Contents:

  • American Precision Arms Gen 4 Fat Bastard Self Timing Muzzle Brake

American Precision Arms Gen 4 Fat Bastard Self Timing Muzzle Brake Orderable Models

List of Orderable Models

  • American Precision Arms Gen 4 Fat Bastard Self Timing Muzzle Brake, 6.5mm, 5/8x24, Stainless, G4F5865S , MPN: G4F5865S , UPC: 810131791469 , Code: 46Y-BMB-RFGH2-G4F5865S
  • American Precision Arms Gen 4 Fat Bastard Self Timing Muzzle Brake, .30, 5/8x24, Nitrided, G4F5830N , MPN: G4F5830N , UPC: 810131791476 , Code: 46Y-BMB-RFGH2-G4F5830N
  • American Precision Arms Gen 4 Fat Bastard Self Timing Muzzle Brake 5/8x24, .30, 5/8x24, Stainless, G4F5830S , MPN: G4F5830S , UPC: 810131791483 , Code: 46Y-BMB-RFGH2-G4F5830S
  • American Precision Arms Gen 4 Fat Bastard Self Timing Muzzle Brake, 6mm, 5/8x24, Stainless, G4F5860S , MPN: G4F5860S , UPC: 810131791445 , Code: 46Y-BMB-RFGH2-G4F5860S
  • American Precision Arms Gen 4 Fat Bastard Self Timing Muzzle Brake, 6.5mm, 5/8x24, Nitrided, G4F5865N , MPN: G4F5865N , UPC: 810131791452 , Code: 46Y-BMB-RFGH2-G4F5865N
  • American Precision Arms Gen 4 Fat Bastard Self Timing Muzzle Brake, 6mm, 5/8x24, Nitrided, G4F5860N , MPN: G4F5860N , UPC: 810131791438 , Code: 46Y-BMB-RFGH2-G4F5860N

American Precision Arms Gen 4 Fat Bastard Self Timing Muzzle Brake Unavailable & Discontinued Models

List of Unorderable Models

  • USED, American Precision Arms Gen 4 Fat Bastard Self Timing Muzzle Brake, 6mm, 5/8x24, Stainless, G4F5860S , MPN: G4F5860S-EDEMO , Code: 46Y-BMB-RFGH2-G4F5860S-EDEMO-RE-A
Compare (0)
Last updated 2026-10-14 UTC.