Iron so the fitment when buttoned up has got the wobbles a lil and you can see thru the line where upper meets lower? What brand...same for both upper and lower? peeps say the wobble wont affect the shooting and I say Bull crap...so open the rifle and look down at the back part of the lower in the area behind the pin....the back shelf.....go get you a piece of foam like the kind that is in gun cases pistol cases flashlight cases...stiff plastic kinda foam....cut you a chunk as wide as the side of the back behind the pin...and taller so that when you mate the two pieces up you have to use pretty good pressure to get it closed and the pin back into the holes....the foam will conform...no more wiggles or slop....it will be now tighter than Dick"s hat band Wash