You need magazine bumper pads. The 22/45 mags are hard to seat in the grip.
You need the replacement spring loaded bolt release lever(Does the IV have a spring loaded lever in stock form?)
I recommend a trigger upgrade
IF you are in an area that allows a suppressor, by all means, DO IT.
I have three Mark III 22/45s, all are threaded, and I have a SilencerCo SS Sparrow. Suppressed 22/45s are a lot of fun to shoot.
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