I have an 80% receiver that I buggered up the safety hole. I have drilled it out to 1/2" have fit a 1/2" alum. rod to replace the material that I removed. My question is how do I secure the rod in the hole, permanent Loctite, epoxy, JB weld, what would be best to use? I will route the excess out of the inside the receiver. Thanks for your help.