Holster Review: T.Rex Arms Ragnarok (Glock 17 – SureFire X300 Ultra) – ATRG,Holster Review: T.Rex Arms Ragnarok (Glock 17 – SureFire X300 Ultra) – ATRG,T.REX ARMS - Ragnarok fitting a Glock 19 with Surefire X300 and KKM compensator. All of our Ragnaroks fit compensators the same width as the slide. They also all fit slide-mounted red,Light-Compatible Ragnarok Holster – DEVILSIX,T.REX Ragnarok Holster – T.REX ARMS,