Steiner has a solid reputation in the optics realm, but I had no idea they make flashlights. It would probably be a good light, but I'm not going to recommend it over lights that I've personally attached to rifles.
The Elzetta Bravo, with AVS High Output head is an outstanding option....if it's not too large. The Steiner's size leads me to believe that it would be acceptable. The AVS head works really well. There's an Oveready bored Charlie with one on the table next to me right now. My primary range bag has a Bravo and a Charlie, both with AVS heads. The central spot throws almost as far as a Malkoff Wildcat, with a bright and pretty large 2nd zone of light outside of it. The optic eliminates the sharp cutoff between lit and not lit, which eliminates potential distraction. Speaking of optics, the optional flood optic is awesome. I've got an AVS with it as my primary bedroom pistol light, and it really lights up a room. I don't currently have any Elzettas hanging off of ARs, because of the next option.
If you'd like to positively illuminate an object/person at 75 yards without excess bulk, the Malkoff MD2 with HOT head is a great option. I've got both MD2/HOT and MD2/T (the original XP-E2 version) mounted onto ARs right now. I do not expect them to be replaced by anything within the next year or longer. The current HOT generates much more spill light than the original M61T, but the T puts more light onto the target.
If you'd like to reduce the size from the above, you may be able to pick up a Surefire KE2-A head for a reasonable price (anything under $200 would suffice), screw it onto any Surefire E2 body, and placed it into your choice of mounts. While waiting for the KE2-A to be released, I bought a Malkoff E2/Scout head for a Viking Tactics L4 body and Z68 tailcap combo, and was very satisfied with the performance. Once the KE2-A arrived, the E2 was moved to a pistol case, the the KE2-A took permanent residence on my 6.8 SPC primary home defense AR.
While I haven't beat on one yet, Malkoff's E2T head on your choice of E2 bodies should be considered. It won't throw as well as the KE2-A or have have as much spill as the M61 HOT, but it's smaller/lighter than an M61 HOT and much less expensive than a KE2-A.
The MD2 and Elzetta Bravo, with MD2 engines, have been proven to work, but their high/low ability isn't needed (IMHO) on a weapon, so I don't personally use them, choosing a less expensive, but rugged alternative. My remaining weapon lights are Surefire 6Ps with Malkoff M61s. They're absolutely reliable, but don't have the reach of the above. I actually ran a Malkoff Hound Dog screwed onto an MD3 attached to a 7.62X51 large frame AR for a few years. If weight isn't an issue, it'll get the job done for sure.
