Timney makes a replacement trigger assy. for the Ruger MarkII. Check out with link
below. I've also seen several posts on the Ruger forum where folks have sent the rifle
back to Ruger, and gotten the trigger lightened by Ruger for them. You might want to
call Ruger, and check it out.

Timney triggers link: www.rifletriggers.com [:@]

Okay, don't know what happened to my link to Timney, but here's another site that
has Timney triggers:
Link: http://www.gunaccessories.com/TimneyTriggers/Ruger.asp

Edit#2: Check out MidwayUSA also. They have Timney triggers, but are currently out of stock on those for Ruger MKII. MUCH CHEAPER THAN GunAccessories. Here's a link:
Link: http://www.midwayusa.com/rewriteaproduct/285329