Handl Defense MK17 Gas Regulator is a great upgrade for the SCAR series of rifles. It will fit both the SCAR 16 and SCAR17 as well as the FN F2000/FS2000. Constructed of billet steel, then heat treated and coated it will give you years of reliable service. The extended and ported profile helps with potential flash during low light operations coming from the gas port of the regulator, while also allowing the regulator to be switched from un-suppressed to suppressed mode with a .308 or 5.56 round. Normally this can be difficult after sustained strings of fire which leaves other regulators extremely hot and unable to be touched with bare or gloved hands.