Get both! big and standard - XS Sight Systems Standard Dot Tritium

That's right. Fit both to your base. Stone the sight tennon so its a friction fit. Don't use the loctite just yet. Ruger over the years has used different pilot bits,some are #54 and other times 1/16th. Who knows what you'll get? Now you can try both dots and see which works best for you. If you like to "bury the sight" like I do, use the Standard. If you prefer the "pumpkin on a post" sight picture then get the Big Dot. Don't worry,you'll use the spare sight.Rugers are like women- there's always another one waiting down the road for you.