Ten years of muzzle device research design testing and manufacturing resulted in our latest revision FlashComp. With winning features of our Hammer Comp integrated the new flash comp adds an additional sacrificial baffle offers better flash signature and is reduced in weight! – The Griffin Armament M4SD muzzle devices interface with our GATE-LOKâ?¢ Suppressors (M4SDK M4SD2 30SD and 30SDK suppressors). – The M4SD Flash Comp optimally combines the functions of three traditionally separate classes of devices- Muzzle Brakes Tactical Compensators and Flash Suppressors. The M4SD II Flash Comp achieved a perfect 5 out of 5 in National Tactical Officers Association testing to achieve the rare coveted NTOA Gold seal of approval granted to devices which achieve perfect evaluations. – Compatible with the M4SD series GATE-LOKsuppressor interface the Flash Comp provides a sacrificial baffle to increase the service life of your silencer. It is also pre drilled and 2.25 length for 14.5 to 16 permanently attached Non-SBR M4 carbine builds. For optimal flash reduction we recommend 14.5 or longer barreled host weapons. Extreme durability low concussion flash and recoil reduction are the wave of the future- the Flash Comp provides an elegant solution to a complex problem. Includes shim set and over-travel stop washer (for mounting to suppressor). – Over-travel stop tab should be positioned at the bottom of the muzzle device (6 Oclock). – Diameter: .863 – OAL: 2.25 – Weight: 2.9 ounces – Materials: 17-4PH Stainless Steel – Finish: Black Nitride – Attachment: 1/2x?28 Thread – Ambidextrous QD Mount – Free of wear prone geometry – Flash tines help mitigate excessive flash -Precisely calculated porting to neutralize muzzle movement – 2 Sacrificial bafflles to extend the life of your suppressor – 17-4 PH Stainless steel to withstand hard use – Lustrous Black Nitride Finish – Griffin Laser Logo Marked – 1/2×28 industry standard Thread Pitch for 5.56mm carbines – Shim set Included – Over-Travel stop washer Included – Compatible with M4SD M4SDK M4SD2 and 30SD series silencers