The Daniel Defense MK18 Pistol equipped with the SB-Tactical SOB Pistol Stabilizing Brace is a variation of the MK18 SBR which has been extremely popular within the Law Enforcement and Special Operations communities. This firearm is classified as a Pistol and not a Short Barreled Rifle (NFA regulated items require ATF approval and a tax stamp). The Daniel Defense MK18 Pistol features the railed forend Daniel Defense currently provides to USSOCOM and a 10.3