With the introduction of the Smith & Wesson M&P22 Compact last week, all sorts of exciting accessories and accoutrements were revealed that would work well with the new, diminutive, rimfire pistol.
LaserLyte's FSL-4 rail-mounted laser sight, part of the company's SCV4 laser series, offers full 5 mW power, dual laser modes and auto-off in a laser sight weighing three-quarters of an ounce. This laser sight is very unlikely to affect your point of aim even at the outer end of the rail.
Four 392 batteries power the tiny sight for five hours in continuous mode and 10 hours in pulse mode. The body of the unit is glass-filled nylon, while the internals are 6061 alumimum for light weight and durability. The sight will fit any accessory rail with one inch of clearance or more.