flip action upside down. Take magbox and slide the tab on the trigger end of the box into its slot in the action. Now get a wide flathead screwdriver and a hammer. Take the head of the screwdriver and push down and in on the other tab on the magbox, at about a 45degree angle. When you get good pressure on the tab (like youre trying to push it into place) take the hammer and give it a whack on the back of the screwdriver handle(not your hand). This should allow the magbox to spring a bit, and as long as your are pushing down and in the box should drop right into place without warping the magbox.

This is also the way to remove the magbox, except you hold the screwdriver flat against the action instead of at an angle.

FYI, If you use pliers instead to squeeze the magbox it will warp, and probably cause you feeding problems. If you removed it this way you could run into problems fitting and/or feeding also.


Hope this helps.