Right Mac all you need now is a small lazer mounted on the barell under neath , set to your zero range , if the beam is lower than your target, it's closer , if over its further away , might help with ranging at nite
Atb
Ps and put a filter on the screen to stop the glare of your face , red been good
As it happens I have both in my box , let me know mate if you need them
Atb