My opinion based on experience.
You don't say what model R1 you have but in looking up a R1 either the standard 5" or enhanced 5" model should do you good service. The only add on I would add and that's because I'm a south paw is an ambi safety. Shoot the R1 about five hundred rounds of standard velocity of .45 Auto in 230 grain hardball and lube well using top grade of pistol lube. Don't skim on lube. After three hundred to five hundred rounds break the R1 down and clean thoroughly including breaking down the slide. Use industrial grade cotton Q tips and clean out the channels for the firing pin and extractor. This will keep your R1 operating reliable. Every 5,000 rounds or so if you feel competent enough to do so, I don't, break down the frame and clean and lube thoroughly. Check out you tube to find the correct way to lube.
Hope this helps.
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