I bought this for my HK VP9 which it fits very well. Not as bulky as some alternatives but still a very bright flashlight and excellent green laser.



It uses small adapters or keys to attach to various rails; there were about 6 included which should cover most possibilities. I tried a couple of different ones which positioned the light in slightly different places on the rail; I went with the one that seemed to lock it down the best without any pressure pushing it off-horizontal. It was easy to tighten and lock in place.



It was easy to adjust the laser to point exactly where the sights align when aiming 10-15 yds away. Since the laser is significantly below the barrel it will not be spot-on at all distances; if it's aligned at 15 yds then at much closer distances the laser will be low. All to be expected though and not a problem with the TLR-4.



After several range tests the light has stayed perfectly zeroed in and doesnt seem to have moved at all. The flashlight is nice and bright and the controls are easy to use but do offer flexibility. You can set it up to be always on or push-to-activate, and to be flashlight only, laser only, or both.



This worked very well for my needs and fit my VP9 perfectly.