Some rough translations applied, can get better though.

The last 2 are custom AKs from ZenitCo and Rifle Dynamics respectively

ZenitCo I can only find furnishing for AKs so it's either that or I'm missing their rifles.

Zenitco is a Russian company that only makes furniture, so that's correct. 2nd rifle is actually a AK103 instead of a 104, since it has the longer 16-inch barrel.

1. Rifle is fine