Hi! today i finished pepping out the AR i tink i will use resin ando bondo and then i will add the torch but i have a problem with the ammo display and the back of the AR(i only attack the big final piece with card dutch tape and i'm worried because i don't know how the resin will react with the card dutch tape...
If I were you I would glue that back piece in, the tape adhesive will most likely fall apart when you resin it, once you do that resin the outside then cut a hole somewhere in the body and slush Rondo or smooth cast on the inside to harden it, then it should be hard enough to bondo the outside, check in my sig on one of the pages I have an AR that I pep'd and hardened it will give you an idea also there is a pic also somewhere in the thread were I show how im going to do the ammo counter........ good luck