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 w/ Streamlight TLR-7