I really dont know for sure but I would imagine that they are quiet simular. When you consider that the AR 15 is basically a scaled down AR-10, I m thinking that other than some minor differences they should be much the same. I will definitely be watching this thread as I am currently putting together and AR 15 and have given some thought to doing an AR-10 as well, especially if with an Upper Swap, I can change calibers like I can on an AR-15. If thats the case then the FAL may find its self spending more time in the gun safe and less time out in the field.