The KAK Industry Plan B Big Hole Brake in 5/8×24 with a .375-inch bore (brand part no. 411-2103-003) is a stainless steel muzzle brake from KAK’s Plan B line. KAK Industry machines it in house from 17-4 stainless and finishes it in nitride. Plan B muzzle devices cut a taper ahead of the threads, which gives repeatable lockup and a proper seal against a Plan B suppressor adapter. It fits the shooter who wants a brake on the muzzle today and a Plan B suppressor hub as an option later.

Key Specifications

• The thread pitch is 5/8×24, so the brake matches a barrel threaded to that muzzle size.
• The bore is .375 inch, the opening size for this version of the Plan B Big Hole Brake.
• This is the Big Hole Brake design in KAK Industry’s Plan B muzzle device family.
• The brake is made of 17-4 stainless steel, a strong, corrosion-resistant material for a muzzle device.
• The finish is nitride, a hard surface treatment that holds up to heat and handling.
• It is compatible with Plan B suppressor hubs, so a Plan B suppressor mount can go on the same barrel later.
• A taper followed by threads gives repeatable lockup and a proper seal between the muzzle device and a Plan B adapter.
• Milled flats on the body give a wrench a place to grip during installation.
• KAK Industry recommends Rocksett and 20 to 25 ft-lbs of torque for installation.
• The brake is precision machined in house at KAK Industry.

Frequently Asked Questions

Can this brake be used with a Plan B suppressor hub? Yes. KAK Industry says its Plan B muzzle devices are compatible with Plan B suppressor hubs. KAK also notes that some suppressor manufacturers will not honor warranty claims if other brands of muzzle devices are used with their suppressors.

What thread and bore does this version have? This listing is the 5/8×24 thread with a .375-inch bore. KAK Industry makes the Plan B Big Hole Brake in other thread pitches and bore sizes, so match the thread to your barrel.

How should it be installed? KAK Industry recommends Rocksett and 20 to 25 ft-lbs of torque, and the milled flats on the body are there for the wrench.

Buy the KAK Industry Plan B Big Hole Brake, 5/8×24

A brake that also doubles as a mount point for a Plan B suppressor hub gives a rifle room to grow without a second muzzle device. Browse the rest of our AR muzzle devices to pair it with your build. Order it from our Lubbock, Texas gun shop for fast, insured shipping.