I own four Kimbers and one Colt Gold Cup and two Rock Island 1911's.
I love the .45 a.c.p. round & own an H&K USP as well.
The 1911 is a stellar pistol.
The R.I.A.s I have are a .45 & 9mm, both run just as well as the Colt & Kimbers that cost 3 X the money! I paid $389 (roughly) for the 9mm new for my sons 12th b-day. (He's almost 15 now) I gave just $300 for the R.I.A. .45 used from a guy that didn't believe in cleaning a firearm.
It was filthy dirty & I honestly didn't think it would even run at all. When I got home I loaded her up and she ran perfectly with all the crud you'd ever imagine.
Of course I stripped her down & gave her a good cleaning and have shot at least 500 rounds thru her without a hic'up.
She runs as well as any auto I own. She isn't as accurate as the Gold Cup or Kimbers but she's plenty accurate enough.
From the bench with good handloads ( or premium factory amm0 ) she gives me 2.5 inchesat 25 yards if I do my part & the trigger breaks clean at 4 pounds. She isn't fussy about magazines either & runs with even el cheapo mags I only use for range work.
You won't regret the Rock Island & it will serve you well.
Should you buy it please post a range report for us.
I'm not sure but I think Rock Island markets the .22 TCM caliber, a .22 cneterfire with some real power. Think I'd like to get one of those to play with.