Yes, the users are allowed to rasp them down to their own fit. Easy to see when they are at order arms.
The most interesting to me is the op rod handle. Look where it should be and you see a curved rod projecting downward. No op handle...but then again why do they need it? There's enough to catch for inspection arms.
There is a vid of them doing drill and one man breaks his stock right off...gunny picks it up and hands it all back to him.