Integrally Suppressed Weapon System for the .300 Blackout cartridge. 9" fluted barrel, target crown, standard pistol-length gas system. The suppressor is an integral part of the barrel, extends to an NFA-required 16 inches in length, so this platform is not classified as a Short Barreled Rifle (SBR) and therefore only requires a single tax stamp (for the suppressor). The suppressor is user-serviceable. Daniel Defense MFR XL 15.0 modular handguard, which features a continuous 1913 Picatinny rail on its top, KeyMod attachment points on the sides and bottom.