Wingmaster trigger questions

Old grease ?

^^^+1, or some kind of grime.

OP, I’d pull it appart and clean it well for starters if you haven’t already. It’s a simple mechanism, there’s a cross pin, a spring and ball detent and the safety button. Lots of YouTube videos on disassembly and replacement.

Once the old safety is out you’ll be able to compare it to the new one, if they look the same it should drop in.
 
I had the enlarged safety and found I kept bumping it with my trigger finger when I didn't want to. Prefer the original factory version
 
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