If You Think Field Stripping a Ruger MK I - II is a Pain...
I just installed VQ sears and Clark hammer bushings+pins on my 2 MKIIs. It made a significant difference on both my 5.5" bull barrel target and my 4" standard model.
If you dread stripping one for cleaning, don't even think about changing the sear or hammer bushing+pin. Or even adjusting overtravel on the factory "target" trigger.
I had previously installed a steel AMT trigger on the MK512 and swapped the target trigger from it into my standard model. After the sear swap, I need to find a longer set screw for the AMT trigger - the trigger travel is reduced so much the current overtravel screw is practically falling out before a change can be felt.
TIPS:
* A pair of tweezers is a huge help with the sear install.
* A small C clamp makes installing the new hammer bushing simple.
* Remove the bolt hold open mechanism completely when adjusting the factory target trigger overtravel so you can lift the trigger high enough to adjust the set screw without removing the hammer, safety, and bolt stop thumb piece every time. You will have to push the trigger pin out and lift the trigger a few times to get the overtravel set. Insert the trigger pin fully between adjustments. Its a PITA.
* If you have a spare hammer pin, you can insert it from the right side to hold the hammer and safety in place when you remove or install the bolt stop thumbpiece.
* Install the mainspring housing and test before re-assembling the pistol.
The safeties on both my pistols drag on the VQ sears. I have to relieve the safety notch on my MK512 at some point. The safety applies, but it doesn't snap into place.
Andy
If You Think Field Stripping a Ruger MK I - II is a Pain...
I just bought a Mark IV 22/45 lite. It’s so much easier to take apart.