Ugg. It may sound anal but I took the top cover, bolt and folding stock off my RR GI Uzi. After I saw my friend destroy the bolt and top cover from an out of battery(the bolt was a GI and new top covers didn’t match) I replaced mine with surplus stuff. I keep the original parts for when I sell it, not that having a GI Bolt is a good thing...
Consider the spot it is in, I still say JB weld(24hr cure) after proper surface prep. It might or might not hold up to the stress of firing but it won’t ruin the finish if you clean up the excess before it sets. Then get a 20 dollar surplus stock and keep the matching one set aside, or shoot it. Up to you obviously.