It isn't up on the forend, but the little LaserMax 'pistol' laser shown here in front of the Burris Fastfire-II is small enough that it fits in real well there, and is easy to activate if the red-dot isn't adequate.
If you really wanted it on the forend, you could mount such a small laser (and the current LaserMax sights are about half the size of mine), you could just use one piece of 'Weaver' or 'Picatinny' base about an inch long, and mount that short piece of base/rail on the front barrel band or cap (with epoxy or screws), or on the wood itself. Either on the bottom or side.
They also make several 'barrel clamp' style mounts with an inch of 'rail' on them, designed for AR-15 barrels, and some could be used on a tubular magazine.
Someone suggested 'in the magazine tube', like the 'guide rod' ones for 1911's; I think WildWest Guns may make something along those lines.
The setup I made just uses 'stock' items and no part of it wouldn't be useable elsewhere if I decided to dismantle it. The only permanent modification was the ones I sweat-soldered (or epoxied) rail sections to the magazine tubes for a LIGHT on, and a spare magazine-tube would put those guns back to 'factory condition' immediately.
I really like having the combination of the Fastfire-II and LaserMax, and with the ability to clip a 290-lumen or so light on when needed, the sighting system is awesome. The sub-sonic delivery of a 265 grain 45 Colt bullet is a plus, too...way more practical at night than touching off an AR-15 and not hearing for a week.
