Two Toks; Slide problem

[jaak]

I have two Tokarev pistols. One is of Polish manufacture and the other is Russian. The accuracy with the Russian Tok is terrible. At 25 yards I am hitting high and left, both by a foot from point of aim, and grouping like a shot gun. The Polish Tok is amazing. It can shoot half inch groups at 25 yards.  In an attempt to figure out why the Russian is so terrible I started swapping parts, one at a time from the Polish to the Russian. The accuracy of the two guns did not change at all. It wasn't until I swapped slides. I put just the slide assembly with everything that does not take tools to remove off of the Polish and put it on the Russian. Barrels, bushing, spring, guide rod, etc. stayed on their original guns. The Russian started to shoot like the Polish and the Polish was shooting like the Russian. 

I have no idea what can be wrong with the Russian slide that can cause it to shoot so poorly.  Any ideas here?

[HMC710]

I would guess it has to do with the lock up (or lack thereof) of the barrel when in battery. Test fit each barrel into the slide and see how much movement you get when "locked up". Compare Link and pins on each barrel.

On an empty chamber, Test each set up for barrel movement when slide if fully forward and ready to fire.

H