Free recoil affects POI in rifles and pistols, and will typically send the bullet high. In rifles, a heavier gun or a suppressor tends to reduce this. In pistols, a heavier gun reduces this a lot. Typically this is only a couple inches at 25 yds. But some guns seem more prone to stringing as a function of grip and stance. Gen 1 M&Ps are the best example of this. The barrel lockup was apparently not well designed.
I can hit 6” steel at 50 yds with a Shadow 2 gripped loosely. A G34 will send it over the top.