The Rearden FHD flash hider in 1/2-28 with a square shoulder (brand part no. 10021) is a Plan B style muzzle device made from 17-4 PH H900 stainless. Rearden Manufacturing designed it to pair with its Atlas and Atlas XL suppressor mounts, and this is the updated version with larger wrench flats at the rear. Installation matters on a device like this, so Rearden gives specific torque guidance and recommends an alignment rod for setup. It is a clean, compact flash hider for anyone running a suppressor on a 1/2-28 barrel.

Key Specifications

• The thread pitch is 1/2-28, a standard 1/2-28 barrel thread.
• The shoulder is square, which seats flat against a barrel shoulder.
• The finish is Rearden’s Heat Treat option, one of the finishes offered on the FHD line.
• Material is 17-4 PH H900 stainless steel, a precipitation-hardened alloy chosen for strength.
• Weight in 1/2-28 is 2.17 ounces, light enough to keep the muzzle balanced.
• Length is 1.723 inches in this thread.
• It is Plan B compatible and fits Rearden’s Atlas and Atlas XL mounts.
• This updated version has larger wrench flats at the rear for a better grip when torquing it on.
• Rearden calls for torque of about 15 to 25 foot-pounds with Rockset on the barrel, and notes that shims are not included.

Frequently Asked Questions

What does this flash hider mount to? Rearden says it fits the Plan B type mounts and is compatible with the Atlas and Atlas XL mounts.

Does it come with shims? No. Shims are not included. Rearden notes that a barrel may need a shim if the manufacturer did not cut a thread relief, and says to time the device with shims only if you want to.

How should it be installed? Rearden recommends cleaning all surfaces, torquing the muzzle device to about 15 to 25 foot-pounds with Rockset on the barrel, making sure it sits square against the shoulder, and using an alignment rod to check the whole system.

Buy the Rearden FHD Flash Hider, 1/2-28 Square Shoulder

If you are building around a Plan B or Atlas mount, the FHD is the matching muzzle end. Order it from our Lubbock, Texas gun shop for fast, direct shipping, and browse more rifle accessories and parts.