That nub should work fine. I've also heard of people cutting a little bit off of the metal rod in the cylinder and using that.
As for the bucking, a VSR-10 bucking will work a lot better than an AEG bucking. You'll have to cut off the little tab on the side of course though. But, if you got the AEG bucking to work fine, then that's cool, I just couldn't imagine it fitting right because of the size.
As for the bucking, a VSR-10 bucking will work a lot better than an AEG bucking. You'll have to cut off the little tab on the side of course though. But, if you got the AEG bucking to work fine, then that's cool, I just couldn't imagine it fitting right because of the size.