This is a remix of https://www.thingiverse.com/thing:580466 . I added the Punisher logo to the front and stretched the bolt spacing out 5mm so they will line up with a standard picatinny rail. Takes 5mm bolts.
I recommend the following settings:
.15 - .2 layer height
1.2mm or 3 layer wall (I have .4 nozzle)
50% infill or greater.(less if using with airsoft)
220°C if using PLA (Higher temp helps prevent cracking from delamination).
With or without support. I tried both. Without support was easier to clean up. Just had some stringing in the rail pocket.