Safariland 6280 Level II or III Retention SLS Duty Holster Mid-Ride, Black, STX, Glock 20, 21 with X200 SLS (Self Locking System) Mid-Ride position allows for excellent weapon protection and quick easy draw Top draw and straight drop cant Level III with optional Sentry installed or tension screw properly adjusted; Level IV with optional Sentry installed and tension screw properly adjusted