The trigger guard on this kids' Savage Arms shotgun attaches with
screws (which are missing). The thread looks like 10-32, but becomes
hard to turn after appx. 3 turns. Is that possibly a weird thread, or
is it just designed to hold the screw tightly?

Secondly, while I could go to Ace Hadrware and buy two very short
10-32 screws, they will not look original because the original ones
were black. Not really a big deal, but is there some place to buy
matching screws.

i