I thought I was having loads of stoppages but no it was actually working but I didn't feel a thing.
It was an evening put on for employers and they were let to have a play with them. Only time I recall it being used.
using an SLR with the H+K conversion to .22 I guess? There was at Browning Barracks and one at Lipstadt.
The indoor ranges were made moderately more interesting if you were firing at the cinema screen. IIRC once you've fired 5 rounds a light was shone through the hole to mark where your shots had gone. There was one scenario where there are four blokes sitting in a jungle clearing minding their own business. As they are happily chatting and cooking their scoff you have to shoot them all. This always seemed a bit unfair... I think it was important to hit the bloke with the cooking pot first but I can't recall why.
Both the indoor ranges I used were at regular army barracks ( but both have since been decommissioned). We had an indoor air rifle range at my cadet detachment - basically a long room with wood over the windows that stank of fear and piss. Now that was shite.