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My aging eyes rely on optics to shoot, so instead of drill / tap the MkIII Standard, I use Weigand no-smith mount for the UltraDot. The mount functions very well for it's intended purpose but didn't work for me: adds bulk, weight and height, and loses the rear sight. So I went costing out drill/tap the upper ... it tally up to about $100 including a $20 rail.... you'll be the judge.

Anyhoo.. came across a brand new unfired 22/45 5.5" upper with box and rail. Thanks to the valuable info I could locate here and other forums, after ~2 hours of careful filing / sanding.. and removing the nuisance LCI, the 22/45 is now tighty-tight fit on my SS frame..

Range time will be tomorrow at the earliest, will update result. Below are pix on before and after.

BEFORE:



AFTER:

You had to fit that peened front lug well underneath the 22/45 receiver for your metal frame. It takes a little bit if time but the result is well worth it. Your pistol looks good. I like the two-tone look. I can't wait to hear how it shoots for you. I know it's a great sense of accomplishment when you finish a project like that!

R,
Bullsyee

Looks like you done a fine job on that pistol. Good luck with it and please let us know how it shoots for you.

Rainy and windy, but I ran 2 mags today for functional check.. no issue, smooth ride.

Will hit the indoor range later this week and will post update.

I like the 2 tone look. I know this took some time to get the lug to fit right, you should be very proud of your achievement. Not very many try what you did.