Originally Posted by starsnuffer
Epoxy is for the tinfoil hat crowd. There's no definition of permanent. Mag blocks installed are fine.
Since you'll be using these as a "fixed magazine rifle" with the addition of a bullet button, you're doubly fine. You don't have to epoxy the end on your shotgun magazine for the same reason.
I dunno it all comes down to a Jury, and their definition of permanent. I don't think they would consider an easily removable block, permanent, but they might.