I got one of these some time ago and just tried it in another gun, a Mossberg 500.
The other guns I've had it in were a Charles Osbourne Damascus barreled s/s and a Webley semi-auto.
The only gun where the laser dot and the barrel bead were in agreement was the probably 100 year old Osbourne. Old time skills can beat new CNC machines.
The Osbourne was a lovely gun and I enjoyed having it but the prob for me was it was too good to take out most of the time. I realised that I preferred something without a history.
Just a comment.