Safariland 6378RDS2222131 ALS Black Fits S&W M&P 2.0/C.O.R.E. Compatible w/ SureFire X300U Right HandThe 6378RDS holster is specifically designed for firearms with red dot sights. The holster features the ALS which locks the firearm securely in place when holstered but still allows a natural draw with a swipe of the thumb release as you establish your grip. Safari Laminate construction makes the holster strong on the outside, while Safari Suede on the inside protects your firearms front sight and finish.