If you’re referring to the length of the holster, it’s because of your light. The light is almost always the longest part of the weapon system, so the holster must be long enough to cover that. The only possible way to shorten the holster would be a small step between the muzzle and protruding light bezel. They take make the whole rig as long as the light so there is a muzzle plug that aligns and retains the muzzle so if the pistol is inserted without light, the retention still works.