I just got my laser sight installed on my big bore blow gun and it is really great. It used the same exact $20.00 laser sight that I got from sportsman's guide and have on 3 of my CO2 pellet pistols. The only difference is that if you buy the remote switch it comes with a replacement battery cap/switch which has a rubber tube leading to a small bladder which you squeeze to turn the laser on instead of the original sideways push button. The laser has four allen head set screws for adjusting and a clamp on base to fit most any round barrel.
Man it really shows how much you wobble when you puff the dart out. I put a tack into the target and using a rest I aimed the laser at the tack and adjusted until I was hitting right where the laser hit. The I moved back to a longer distance and only had to adjust the elevation
for distance. I'll have to decide what range will be best to zero it as the trajectory is not too flat.

Sure does give me a lot of confidence
in my shooting. I wonder if it would work on a bow?
Sure do like the Cold Steel blow guns. So far I have the 5 footer and the take down models. Next will be the Pro 5 footer. I also just got the Multi Dart set and am having a ball with it. I have stopped using my old .40 cal blowgun except for shooting paint balls at stray dogs
on my property. I love primitive weapons. I have a couple of very nice slingshots, two bows, Japanese swords, a Naginata, and lots of other toys to keep me amused. Now I want a couple of the hunting boomerangs, a bola, a pair of Escrima sticks, a fighting staff and anything old and interesting. I wonder why CS discontinued those Indian Lathi's? They looked like fun.