Has anone used one of these? Seems like a good thing to have around if you need it.

 

http://www.combathunting.com/AR_15_M16_M4-AR15_M16_M4_223_Laser_BoreSight_5_56.html

I think this was discussed already. LBSs are a good thing to have around, but nothing will zero your rifle betterthan actual range time. Look on the internet for a downloadable 36 yard line BZO target.

I have a different kind, but like Ben said, it will probably get you on paper but nothing is like actual range time.

 

If you are going to use this outdoors at 50 or 100 yards I HIGHLY recommend picking something like this up...

http://www.reflectivelyyours.com/generic169.html

I think home depot or lowes has something similar...maybe a bicycle shop (people use it on helmets and on bikes)...actually even those reflective driveway markers would probably work...just don't shoot them.

 

You will not be able to see the laser without it.

I have the same laser bore sighter. Regarding just the sighter itself, it burns through batteries quick.

I've used something similar for my shotgun. As everyone has said, it'll get you on paper but you need to shoot ammo to get it zero'd in.