ALS (Automatic Locking Systems) secures weapon once holstered; simple straight up draw once release is deactivated SLS (Self Locking Systems) Rotating Hood For use with red dot optic-equipped weapons SafariLaminate thermal-molded construction protects handgun and sights Suede lined to protect handgun's finish The 6360RDS holster is specifically designed for firearms with red dot sights mounted to them. This holster with the Automatic Locking System (ALS) builds on the foundation of the Self Locking System (SLS). It locks the weapon in all directions upon holstering, it's operable with the thumb, and the weapon can be drawn straight out of the holster with no twisting required. Gun fit: FN 509 MOS ITI M3 FN 509 MOS Streamlight TLR-1 FN 509 MOS Vortex Viper FN 509 MOS Burris FastFire FN 509 MOS Inforce APL FN 509 MOS Nightstick TWM-350 FN 509 MOS Nightstick TWM-350S FN 509 MOS Nightstick TWM-850 FN 509 MOS Nightstick TWM-850S FN 509 MOS Streamlight TLR-1HL FN 509 MOS SureFire X200 FN 509 MOS SureFire X300 FN 509 MOS SureFire X300U FN 509 MOS Leupold Deltapoint FN 509 MOS Trijicon RMR FN 509 MOS Dr. Optic FN 509 MOS J Point