Yes its a mac, most aftermarket parts still fit o,n them. They are only .5mm larger, and its deffinitally a straight cut reciever I checked before I bought it. As far as the furniture its just not comfortable for me. The PG is too big for my hand and the Lop is a little long, it just doesnt feel like an AK. I think ill shoot much better with dome new furniture.
The stain job on yours looks great though, you do that yourself?