This is the Front iron sight is made for the TMC STG 44 shroud.
I have noticed that 7/8 barrels are not made the same... so it may no fit your barrel.
so for now print a small test part of it to test fit the barrel. I will take a look at this in the winter period.
shell: Wall line count: 4
At first did I had some trouble with the clamping mechanism, it would crush the infill layers.
but this design is more flexible. so who knows, maybe is already works if you print every thing at a 40% infill. but if you want to be sure like I did. than make the place were the bolt and nut goes. a 100% infill area.
1x M3 nut
1x M3 15mm bolt HEX