The biggest difference you're going to face is that headspace is set at the same time as timing of the barrel. With a FAL, barrel installation is simple because you set headspace separately via locking shoulders. With the AK headspace and barrel timing are done at the same time, but with a straight push vs timing of barrel/receiver threads. Other than that, straight forward build like the AK and FAL. I would highly suggest that you lap the bolt lugs to the receiver prior to timing/headspacing the barrel.