The Griffin Armament M4SD flash compensator (Griffin Armament part no. XHP556FC) combines three traditionally separate muzzle device roles, muzzle brake, tactical compensator, and flash suppressor, into one 2.25-inch device rated for .223 Rem/5.56 NATO and threaded 1/2 inch-28 tpi. It’s built for permanently attached, non-SBR M4 carbine builds running a 14.5 to 16-inch barrel, and it scored a perfect 5 out of 5 in National Tactical Officers Association testing, earning the rare NTOA Gold seal awarded only to devices that achieve a perfect evaluation. Because it’s compatible with Griffin’s M4SD-series GATE-LOK suppressor interface, the compensator also serves as a sacrificial baffle that extends the service life of a Griffin suppressor down the line. It ships with a shim set and an over-travel stop washer for suppressor mounting.

Key Specifications

• Rated for .223 Rem/5.56 NATO.
• Threaded 1/2 inch-28 tpi for standard 5.56 muzzle fitment.
• Measures 2.25 inches in length.
• Earned a perfect score in National Tactical Officers Association testing, receiving the NTOA Gold seal.
• Compatible with Griffin’s M4SD-series GATE-LOK suppressor interface.
• Functions as a sacrificial baffle that extends the service life of a compatible suppressor.
• Built for permanently attached, non-SBR M4 builds with a 14.5 to 16-inch barrel.
• Includes a shim set and over-travel stop washer for suppressor mounting.
• Combines the roles of a muzzle brake, tactical compensator, and flash suppressor in one device.

Frequently Asked Questions

Is this itself an NFA item? No, this is a standard muzzle device; it becomes part of a suppressor’s mounting interface only when paired with a compatible Griffin suppressor.

What barrel length is this built for? Permanently attached, non-SBR builds with a 14.5 to 16-inch barrel.

What’s included in the box? A shim set and an over-travel stop washer for suppressor mounting.

Buy the Griffin Armament M4SD Flash Compensator

Get NTOA Gold-rated flash and recoil control on your 5.56 build. Order the GRIFFIN ARMAMENT M4SD compensator from our muzzle devices lineup, and our Lubbock, Texas team can help confirm thread compatibility before it ships.