Just a thought if you haven't purchased yet ...
Mentioned only once that I saw in this thread, have you considered the S&W M&P .22 Compact? Comes from the factory with a threaded barrel with a suppressor in mind (you have to buy the adapter for it), so you know it is intended to run on subsonic ammo. No need for Mini-Mags. Mine has never burped on any ammo it's been fed.
I like mine, lots of people like theirs. And it is essentially the same price as the G44.