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Here is my WIP Mark IV Tactical set up. I'm waiting on a Volquartsen competition kit, my Dead Air Mask to get out of NFA jail, and a low profile mounting plate to relocate my Holosun lower and further back to the rear sight dovetail. Then I can remove the top rail and fill the holes with plug screws that Ruger sent me for free for a clean look. It's worth noting that the Mark IV uppers are interchangeable. I picked up a Mark IV 22/45 Target upper with a plastic Ruger case from the Volquartsen clearance section for $40+15 shipping. It swaps out in five seconds when I want to shoot with regular target sights instead of the red dot sight and beats having to take the Holosun on and off and re-zero it every time. It is a serialized part and counts as a firearm so it has to go to an FFL but luckily there is a local shop that does free transfers near me.
great idea, i need this now that i have my suppressor and my mark IV isn't threaded
edit: unfortunately at this time they only have that deal on the bull barrel i already have not the 22/45
I think Volquartsen buys Mark IV 22/45 targets in bulk and uses the lower frame on their own builds. They have no use for the upper and sell them off in the clearance section. This company sells all sorts of Mark IV uppers but at these prices you may just want to get another Mark IV for your suppressor.
The Farrow Tech low profile red dot sight mount came in yesterday. I removed the picatinny rail, drifted off the rear sight and mounted the Holosun lower and further back. I think I prefer the sleeker look of this and having the red dot sight closer to the traditional sight eye level.
This.I can compare the MK III 22/45 and MK III Competition (Target?). The 22/45 has some aftermarket VQ parts that give it a weightless trigger and I still find the more stock MKIII to be easier to shoot accurately. Like others said: longer sight radius, heavier, etc. The 22/45 is plenty accurate for my needs and I find it to be more fun to shoot. I shoot at stuff though, not much for bullseyes.
Just to be clear, the 22/45 is a MK III not a MK IV Lite.