stchman wrote:
I ordered two more mags and a Tandemkross bushing to disable the stupid magazine disconnect.
Yes, the Tandemkross bushing replaces the magazine disconnector, its spring, and the special bushing that goes with it. It's an elegant solution that allows you to use the Mark III hammer. When I bought my Mark III pistol, the Tandemkross bushing was not yet available, so I just ended up substituting the Mark II parts. (It's obviously cheaper to just buy the bushing than to buy the whole Mark II hammer -- that is, if you can find one.)
Another item that Tandemkross sells is a filler piece, in blued or stainless, that replaces the loaded chamber indicator (if you want to remove that as well).
Regarding magazines, there used to be an anomalous situation in Ruger's parts department, so that all the parts to put together a magazine totaled considerably less money than a complete magazine. I don't know whether they have corrected this, or not. It's worth checking, and could potentially save you some money.
The Mark III and Mark IV magazines are identical, except that the Ruger emblem on the baseplate is silver and red for the Mark III, and all black for the Mark IV. Magazines that come with the guns have a little opening on the left front, near the top, for the nub on the trigger of those guns (it's supposed to help fully seat the magazine as the trigger is pulled). That's a questionable feature, and it's worth noting that some replacement magazines from Ruger don't have that opening. The gun will function fine without it.