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I think its to make a reflector to bounce the light down the tube

I actually tried a toliet roll on the Ci7 - works to a degree to focus the light a bit - am looking at making something to modify...

Also have a think about the beam - spot or flood
If you take a white light torch and put it on the ground you see all the stuff around you lit up
Now point it to the sky - except for particals in...

I use a pacmeyr (that’s spelt wrong) slip on pad on my 308
Gives about 1 inch more LOP - I leave it on always now though

I have rapid fired 3 rounds of 308 and not bumped my eye - would have hit...