The ALS system is the next evolution in retention holsters and builds upon the successful Self Locking System (SLS). With many patents to its credit, the key to this system is an internal locking device that secures the weapon in all directions simply upon re-holstering, providing Level 1 or 3 Retention which can also be elevated to Level 4 Retention with the addition of the Sentry.
This video offers product information and instructional training for effective use of the Safariland ALS holsters.