The tlr-1 hl is awesome - Streamlight TLR-1 HL CR123A LED Rail-Mounted Tactical Flashlight

I mounted it on my Sig P320 yesterday. Fits like a glove. The instructions for mounting were not helpful (for me), so I did what everyone else does and went to YouTube. Other than that, I love, love, love this light. I took it to the range and as luck would have it, I was the first one there. So we turned the lights out and gave it a whirl!! And I had a blast- literally and figuratively. The light is powerful, easy to use, full stream with the right switch and double tap strobe with the left. Target practice with the strobe was incredible. Aside from the absolute fun that I had with this, it balances my gun nicely. Everyone should have one! It is an impressive light source!!