HOLSTERS WILL FIT: Walther | 4.00" BBL | With Optics + Light | PDP Compact and Full Size Frame 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 Streamlight TLR-7, Surefire XC-1, XC-2, Nightstick TCM- 550XL/XLS, or Inforce APLc Holster will have full retention capability with or without a light attached