New to S&W Forums.... Just bought a BG-380 last month, shot 30 +/- Rounds through it. Before I cleaned it I turned the laser on and it was over 2 feet high and to the right of my iron sights, must have moved while shooting. The laser also turns off at random times, between shots. The screw that holds the laser in has a stripped head, supposedly I bought a "new" gun but I know I did not strip the head. The laser body appears loose and crooked in the frame as well. This could possibly be a reason why some people are having trouble with shot/laser variation.
Long story short, Love the gun, annoyed by the laser. Have written S&W about it, we'll see what happens.