The ones j build couldn't be turned into a real gun very easily?! They have a plastic main frame...unless someone went go the trouble of making or purchasing a real frame ... even then there are issues with trying that out...when I do sell them, which unfortunately didn't very often I always include a disclaimer saying I am not responsible for what happens after they receive the prop...hopefully that covers me? Most of the people I've done mods for are fans of BR though and I doubt they are looking to use an OW to try and make a real gun...it would turn into a grenade in their hands?!
Wish you luck...if you decide to build one please post pics!!! Cheers!