[tobnpr]

POI will most always change with the addition of any muzzle device.
Ideally, the change in harmonics is consistent- and therefore known and not an issue as it is anticipated and compensated for. Anyone with a suppressed rifle knows the POI shift and simply dials the difference depending on whether the device is on, or off, the rifle. "Accuracy" should remain the same.

Barrel contact that's inconsistent, such as lying it over sticks, or barrel-mounted bipods (cringe-worthy) will not produce consistent changes to harmonics and will cause not only a POI shift- but often a degradation in accuracy as well.