HOLSTERS WILL FIT: Glock | 4.00" BBL | With Optics + Light | 19, 23 Gen3-4 with Burris Fastfire, Trijicon RMR, SRO, Vortex Viper or Venom and Inforce APL, Olight PL-Pro or Valkyrie, Nightstick TWM-350, TWM-350S, TWM-850, TWM-850S, ITI M3, TLR-1, TLR-1HL, Surefire X200, X300, X300V, or X300U