I found this cool website reviewing the streamlight TLR-2 & TLR-1. Feel free to check it out.
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There are small brass fixtures on the bottom and side of the laser unit. You fit a tiny allen wrench in there to move the laser point up and down (the one on the bottom) and left and right (the one on the side). Streamlight probably has a downloadable user's manual you can look at to see the instructions.