The STI is a polymer framed 1911 isn't it? I own one double stack 1911-A2, a RIA .22TCM / 9mm convertible. It holds 19+1 rounds of TCM or 18+ 1 rounds of 9mm. A bunch of ammo in one loading. The trigger is still all 1911 and of course the safety is still located / functions the same as an A1, but, that's where all similarities end as far as handling is concerned. It's kinda fat. You get used to it after awhile and when you pick up an A-1 again the A-1 feels tiny. I own both the single stack and, as I said, the double stack. The single stack wins hands down, but I didn't buy the double stack because I thought it was superior, I bought simply because I wanted it. If you want it, buy it. I dare you.
Not a rimfire but... Just ordered me a new S&W M&P 9mm Pro Series C.O.R.E (Competition Optic Ready Equipment) Performance Center pistol w/ 4.25" barrel. Comes with two 17 rnd. magazines and the slide is milled to accept a MRDS. Now I have to find a MRDS and a hloster.
I've got a lot of rimfire ammo on hand but am not shooting much out of fear of non-replenishment. Been shooting the air guns instead. In fact, looking for a new, but modestly priced, target air pistol. Any ideas? Under $300?
I think that since it's a hunting rifle then what works best for you is what's proper, no matter the type of action. Just don't use those cockamamie see through scope mounts. The scope should be mounted as close to the bore as possibly to reduce parallax.