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I just put a volquartsen accurizing kit on my mark iii (Dvor had them for around $80) and if you get the mark ii kit it comes with the bushing you need to get rid of the mag disconnect. Trigger is now very light (2 pounds?) with about 1/16" take up and nearly no over travel.
+1
I put their trigger and sear in my MKIII and a MKII spring/bushing to remove the mag disconnect. The trigger is so light now it's ridiculous and disassembly is much faster/easier without the mag disconnect. I don't recall any of the work being difficult to do. The hardest part was adjusting the trigger over travel screw to minimize over travel without preventing it from going boom.
The Volquartsen internals are great but also take a good look at the Tendemkross trigger. Have one on my 22/45 and like it a lot