Great laser, no filler. also no button. - Holosun Compact Laser Sight

Holosun got it right with this one. I wish I'd known about it before I spent nearly twice as much on their version of the same thing with additional visible laser. That said, the only thing this is missing that the visible+IR version has is its own momentary trigger built into the housing. If it had the button I would have given it 5 stars. Really, 4.5 would have been ideal but you can't do half stars here.

However there is another big plus to the 117: Its laser emitter aligns directly with the bore's vertical axis (or at least close enough) so there's no need to accommodate for an "X" shift when zeroing. That alone makes it a great buy. Also comes with its own tape switch and switch mount, which is always a plus.