Can you guess why?
https://www.youtube.com/watch?v=YrqiF1zEgHA

Is that a plastic frame?

No sir no way ---- steel

I'll take a stab at it. When I was looking for a 10mm, the STI was my first stop. At the time, they had just quit making the STI Perfect 10 and wasn't making a 10mm anything. I'm going to assume this gun is the STI Apeiro that originally was chambered in a 40SW and reamed to a 10mm with a few other nice things added. Regardless, per the vid, it's one of those love hate guns. You love how accurate it is but hate it when you can't hit anything with it cause it ain't the guns fault.

Lol, I love it : )

Nothing but love here it hit everything I aimed it at.

Trapper you got it right.