Well the Krink and AKP have totally different principals.
The Krink is supposed to have a flip sight, that is marked for 200 and 400... the point is that for a Krink you would sight it in for the first one to hit dead on at 200, then flip the sight for the longer 400 meter range. What I would do is sight in the iron sights the way they were intended, then buy a Russian Kobra for the side mount. The Kobra is supposed to be the best, easiest, most effective sight out there for semi-close ranges. I would sight the Kobra in for 100 yard hits and use the sights for longer ranges. After all, the Krink was meant to be a PDW, not a flat out engagement rifle... so really, don't expect much at longer ranges.
If it is an AKP, it has the tradditional AK sight, and should be sighted in for 100 yards. To get a clean shot to about 350, where a round would be within the torso of a human man as far as elevation, move it to the FIRST block. Not the 1, the [] shape.