Arrow laser shot is marketed over there by the guy who does the Bore & Choke Vernier caliper.
Interestingly I noticed at a shot show here in the UK last weekend that you could use the Arrowlasershot to train yourself to mount and control your gun movement.Just down the Hall was a Swedish Video Trainer called the ST2 that for $42,000 showed you your poor gunmount and the line that you had taken to get onto (and miss in most cases)the bird.
The laser shot looked like good value after I had seen that.
