http://tinyurl.com/pcxylrx

Volquartsen threaded the barrel, relocated the front site, and included
a thread keeper, all for about $100, with a quick turnaround. The red
dot I have mounted on the rail is a decent on, and doesn't weigh much,
but I think I need one that is smaller. Also, I have to cut the mounting
rail back by about 1-1/2"...I'm not going to mount anything but a red
dot on this pistol.

This is the 512 model Ruger, not the 22/45 model.
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Proud to be a Liberal.