another thing to take into consideration, with an underfolder you cannot install a scope rail. well you can, but you will not be able to fold under because it will hit the scope rail. I drilled into the side of my receiver and mounted a rail, but the only way to mount the scope was removing the entire underfolder assembly and sliding it on, then installing the UF again. the button to lock the position of the stock is in the way. I removed that junk and If I ever do scope it again I'd use a receiver mount scope. but with an under folder and some side folders the POSP type scope is out of the question. I think the KVAR will work because it folds either way.