Having purchased an aftermarket stock for my 10/22, I have been plagued with the usual problem of not having the magazines (drum and banana) not releasing (by the mag release lever) without yanking them out because of a too-tight fit. I have begun "shaving" (sanding) the insides of the mag well, however, wonder if I can go too far. Does the gun "upper" mechanism hold-in the mag, or do the mag well sides hold it in place? Hope this is clear.