Today I found out that one of those recoil buffers and a scope mount/receiver cover from Norinco are incompatible. The recoil buffer will not allow the scope mount to lock into place fully. When I took the first shot with my buffered, scoped AK the cover and scope popped off the receiver, bounced off my forehead, and landed back on top of the receiver. As I took the recoil buffer off the recoil spring assy I felt a tickle between my eyes and found blood running down. Oooops. At least nobody saw it happen, that would have been embarassing. Now I have a almost verticle 3/4" line just above my brow till it heals and vanishes. I look tough now It didn't even hurt that much, oh well. Once the buffer was out it worked fine.