The only thing I am using out of the laser guns are the lenses. The rest of the components are stock DBC and DBU stuff.

I am just noticing a difference in range with the same components so was wondering where I should look to fine tune the poorer ones. There doesn't seem to be much difference in the IR emitter set up , so maybe it is not the shooting tank that is the problem but the tank receiving the hit. All the emitters are the same and all are driven by the same circuit, so I would expect them to deliver similiar results.