Volquartsen LLV 6 receiver, VQ Accurizing Kit and Bolt, Tandemkross Bolt Release and Safety, Fiber Optic Front Sight and Adjustable Rear from VQ as well. Herrett Grips.
This is my Steel Challenge gun and works 100 percent. I use CCI Mini Mags in the winter and Normal TAC 22 for when it's warm.
Wondering how much more accurate it is from basic MK IV vs after all the changes/additions? I ask because I am an "if it ain't broke, don't fix it!" kind of person. Just curious.