Bore sight - new 9mm pistols - Sighting System Instruments Sight Right Bullet Laser Bore Sighter 9mm

I only gave this 4 stars, why, I have yet to actually shoot the pistols to determine how close the bore sight actually places my group of shots. Nothing against the laser, I simply have not been able to get out and test the results.

I will say, very easy, unscrew the back of the sight, plop the batteries in, be careful, they are small, and make sure if you drop them in, they do not bounce and change from showing "+" to "-", which one of mine did, not a problem, drop it back out and be careful.

Slap it in the bore, gently allow the slide to butt up against the back of the sight, they say do not close all the way, and then using the reflex sight, gently align the laser sight with the bore sight. Pretty straight forward.