The KAK Plan B Radial Brake in 1/2x28 threading is a versatile muzzle device engineered for .223 and 9mm platforms. Built around KAK Industry's Plan B system, this brake features a tapered design that seats into Plan B suppressor hubs, delivering repeatable lockup and a solid seal—crucial if you're planning to run a suppressor. The radial brake design offers recoil management for shooters looking to tame muzzle rise on lighter caliber rifles and pistol-caliber ARs without compromising suppressor compatibility.

Manufactured entirely in-house at KAK, the Plan B Radial Brake is machined from 17-4 stainless steel and finished in nitride for durability. Milled flat surfaces on the rear make installation straightforward and repeatable, so you get the same timing and lockup every time you remove and reinstall it. Because the taper and thread design handle alignment, you don't need timing shims or modifications—just apply Rocksett and torque to spec (20–25 ft-lbs) for a secure, consistent fit.

A practical detail worth noting: some suppressor manufacturers restrict warranty coverage to their own branded muzzle devices. If you're pairing this brake with a suppressor, confirm compatibility with the silencer maker before purchase. Weighing just 2.5 ounces, it won't add significant mass to your barrel.

Key Features

• Tapered design with threaded interface for repeatable lockup into Plan B suppressor hubs
• Radial brake geometry for recoil reduction on .223 and 9mm
• 17-4 stainless steel construction with nitride finish—corrosion-resistant and hard
• Fully machined in-house by KAK Industry for quality control
• Milled rear flats (13/16") simplify installation and ensure consistent seating
• No timing required—taper and thread handle alignment
• Lightweight at 2.5 ounces

Specifications

Thread Size	1/2x28
Compatible Calibers	.223, 9mm
Material	17-4 Stainless Steel
Finish	Nitride
Overall Length	1.850"
Rear Flat Width	13/16"
Weight	2.5 oz
Installation Torque	20–25 ft-lbs
Recommended Thread Locker	Rocksett

Frequently Asked Questions

Will this muzzle brake work with my suppressor?

The Plan B Radial Brake is designed to seat into Plan B suppressor hubs. If you have a suppressor made by another manufacturer, check with that maker first—some brands restrict warranty coverage to their own muzzle devices or do not guarantee compatibility with third-party brakes.

Do I need to time this brake to my barrel?

No. The tapered design and threaded interface handle alignment automatically, so timing shims or modifications are not necessary. Simply apply Rocksett to the threads, install, and torque to 20–25 ft-lbs.

What thread size is this, and what guns does it fit?

This is a 1/2x28 threaded brake, the standard pitch for .223 Remington and 9mm AR-15 barrels and some 9mm pistol barrels. Verify your barrel's thread size before purchase.

What material is it made from, and how durable is it?

The Plan B Radial Brake is machined from 17-4 stainless steel and finished in nitride. Both the material and finish provide excellent corrosion resistance and hardness, suitable for field use and regular cleaning.