I believe that Kvars kits areparts which are taken right off the production line before completion. That means they were never actually weapons. So , I believe that no gas port has been drilled in the barrels, and that other "final fitting" procedures have not been done.
I know that Todd, over at Ohio RapidFire has kits coming in.
These kits are "take offs" so that means they were actually weapons at one time. Easier build in my opinion.
Todd's will probably be less expensive. He is a top notch seller also.