laser/light combo
for the SW99 and later walther P99 with the more common style accessory rail, try the TLR2 by streamlight. as it comes standard, you'll need to change out the cross-bolt key to a sw99 unit. i think the current stock TLR2s are delievered with the key included...but if not, a phone call to streamlight gets one in the mail to you immediately. the TLR2 uses the same batteries as surefire flashlights, uses an unbreakable LED for 80 lumens of light, and the laser is mounted very compactly as a unit. operation is pretty much like any other tactical light, toggle switch for momentary on or constant on, and another toggle for laser only, light only, or both.