Customers including AK Operators Union have reported these milled carriers are a drop in for the C39V2. We recommend also using the Polish AK bolt we offer or a standard mil spec bolt, but you MUST check headspace if installing a new bolt! Some customers have reported needing a new recoil spring assembly as well, while some do not, it depends from rifle to rifle.
These bolt carriers will also work just fine in stamped pattern AK's as well, however since these are higher cost and are more scarce, we recommend purchasing a stamped pattern bolt carrier instead if that if your intended use.