This isn the sight I'm asking about. Also, what is the mounting system?

Thanks.

Originally Posted by Mackay_Sagebrush
Ruger .45 Convertible single actions are extremely versatile revolvers.

I have both the standard large frame version and a mid frame Flattop and both are tack drivers. Some times they need a bit of tuning to get there but the results are worth it.

They will literally stack 5 shot one ragged hole 25 yard groups with proper ammo.

In this case, this is what is called .45 cowboy special which is a .45 Colt cut to .45 ACP length.

[Linked Image from i.imgur.com]

You can shoot those for light weight, low recoil loads, or heavier "elk/moose" type loads, all just by swapping ammo.

Here is a .45 Cowboy Special, .45 Schofield, and .45 Colt aka Lng Colt:

[Linked Image from i.imgur.com]