The Blackhawk's Omnivore multi-fit holster accommodates more than 150 styles of semi-automatic handguns. The active retention mechanism locks onto a proprietary rail attachment device, not the frame of the handgun for the non-light bearing model. Its instinctive thumb release disengages the locking mechanism from the rail attachment device when drawing the handgun. Fits most semi-autos with SureFire X300/X300U-A lights.