Summary

Terrify, distract, (or most likely) confuse your enemies with these picatinny/weaver-mounted Tactical Cat Ears. Designed for side mounts as shown above with 0, 30, and 45 degree options, and even a blank one if you need a different angle or maybe a paperweight.
The 0 degree option has holes for a bolt in case you wanted to lock it down, the others you'll have to get creative if you want a permanent solution; A little bit of tape on the rail should do the trick. I got best results from the 45 degree, also remember to copy then mirror the ears in your slicer.

Intended for airsoft, but like who am I to stop you.