Sharing all of the features of the Sandman-S and Sandman-L, while adding only 2.9 to your muzzle. The K has the class-leading solid weld Stellite baffle core and detachable front cap, just like the rest of our Sandman Series. The exterior is finished in Cerakote for ultimate durability. Compatible with 5.7X28MM (FNH), 17HMR, 17 HORNET, 22 HORNET, 5.56 NATO, 22-250 REM, .204 RUGER, .243 WIN, 6.5 CREEDMOOR, 6.8 SPC, 7.62 NATO, 7MM REM MAG, .30-06 SPRINGFIELD, 300 BLACKOUT, .300 WIN , 5.45X39MM. *Note- Barrel must be concentric with bore- 7.62X39MM, and 7.62X54R.