Might work for you, depending on your weapon setup - Streamlight TLR RM 1 Long Gun Laser/Light 500 Lumens, Black, Aluminum

TL;DR
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Light/laser = good
Remote Pressure Switch mounting = uh oh

Review
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My frustration with this light is the product option which includes the picatinny/1913 rail-mounted remote pressure switch. The light itself is good, and works as advertised. The mounts for attaching the pressure switch to a standard picatinny/1913 rail (two small black plastic holder clips) would not securely attach to my rails, but instead kept falling off. My rails are normal, and other accessories fit and are secure, but the mounting tabs that come with this light are, in my experience, complete junk. The pressure switch kit also includes an adhesive mounting option, but mounting a pressure switch with a cute little sticker seemed ghetto to me at best. How about a "Hello-Kitty" mounting option while we're at it? (hahaha)

I recommend the light itself, particularly if you want to mount it on your 12-o-clock rail (the top of your rail). It'd be easy to activate with either hand using the push-button (not the remote pressure switch). If you want to mount a light to the side of your weapon, the push-button activation switch stuck out a bit too much to be comfortable for me (which is why I tried using the remote pressure switch). In the end, due to my particular setup, I returned the light and will try a different option.