About 20 years back, I was managing a trophy-caribou camp in Canada's Northwest Territories. The camp was a 150-mile bushplane trip from civilization, meaning whatever was done had to be done with what was on-hand.
Grizzly bears were coming into camp every night, drawn by the smell of our caribou. I NEEDED some way of seeing to shoot if necessary.
I had a pair of GENUINE M-14 rifles, and picked one to be the "night rifle". I placed a 3-cell flashlight along one side of the fore-end and duct-taped it in place. (It was actually very solid.)
I then placed a narrow strip of fluorescent-red tape on the front sight, where it was brightly-lit by by the flashlight.
With the light aligned so that the front sight appeared right in the middle of the light's "spot", very accurate shooting could be done within the range of the light...fifty yards or so.
The ammunition used was handloaded 180-grain Nosler Partitions, which (as usual) worked perfectly.
For a field-expedient set-up, I was rather pleased with how well it worked out.