M320 Holster. When .45 is just not enough. Posted February 18, 2011 in Other Gear & Gadgets by Steve Johnson with 20 CommentsTags: 40mm, grenade, launcher, military S&S Precision manufacture a holster for the 40mm M320 grenade launcher. Everything else aside, carrying a holstered 40mm grenade launcher has got to look really badass! Soldier Systems has more about the holster here.