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The Kriss Usa Kriss Vector Folding Stock Adapter is not compatible with an AR pattern rifle or pistol. You would need to use the OpticsPlanet Exclusive Law Tactical AR Folding Stock Adapter, which retains the ability to house your buffer assembly and is designed specifically for AR platform rifles and pistols. It can be found by using the link below:
https://www.opticsplanet.com/law-tactical-ar-folding-stock-adapter-gen-3-m.html
I know it’s been three years but for clarification, I believe it would work fine with your POF PSG22 as it is a .22LR weapon and doesn’t have a buffer or buffer spring. I use a Hera Arms SFU (Side Folding Hinge) which is very similar to this design but with the button on the side on my AR22 without issue. The Law Tactical unit is great, but costs significantly more, is bigger and more complex, and is made of steel so it weights about 8-9oz. On a lightweight 22LR that is mostly polymer like your POF it would add significant weight and change the whole balance of the gun. Plus it costs about $100 more.