K22 race

[Bajan]

Hi, I was shooting my k22 Race at 25yds supported and was shooting groups at 1 inch.
One group was low by probably 5 inches and I am struggling to explain this.
My Shield sight is fixed with two screws and I wondered if it is worth drilling and tapping the slide for two additional securing screws.
Any other thoughts?

[BamBam]

9 round groups?

I would get a different sight, never got on with shield red dots.

[Bajan]

5 round.

[Bajan]

I guess differences in support might have contributed but surprised at the 5 inch drop in the group.