In regards to showing LaserGrips on guns, my suggestion is to do what I've seen in some other catalogs.
Take the picture. Go into Photoshop, and tint the gun an impossible color like orange, blue, or just grey it out with increased brightness, leaving only the lasergrips looking normal.
For holsters, put a Redgun in it instead.
And include a statement in the photo of GUN NOT INCLUDED.
Yes, people are that stupid.