HOLSTERS WILL FIT: Glock | 4.00" BBL | With Optics + Light | 19 MOS, 45 MOS Gen4-5 W/ Sig Romeo1 Pro, Vortex Viper or Venom, Trijicon RMR, SRO, Deltapoint Pro, Holosun 407, 507, 508, or 509, Aimpoint ACRO, or Burris Fastfire 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, 300V, or X300U