Greatly improves the mkiii 22/45 - Volquartsen Firearms VC Target Frame, 1911 Style for Ruger MK

If you've got a MKIII 22/45 (one piece lower version with non-replaceable grips), this Volquartsen unit is a great upgrade. Not only is the trigger much better, it also allows you to use 1911-style grip panels of your choice (a bit of fitting might be required to clear the Ruger-style controls). It also provides an easy-to-use shim kit, so you can adjust to get a snug (but not overly tight) press fit between the Ruger upper and Volquartsen lower.

No, not exactly cheap - but well worth it and I wish I had done this years ago.

Works with other Ruger uppers, but not all - so make sure your's is on the list before ordering.