The AR7 I had was made by Charter. The hollow stock was filled with Styrofoam,except for the places where the pieces went.
I have been told by other people, both owners of the Henry version and the Armalite version, that there was no Styrofoam in THEIR stocks.
Is yours hollow? Or does it have foam?
While the original gun came with one magazine, and only one slot in the stock for one (I understand the Henry is slotted for two), I found that the receiver would fit in the stock with the magazine inserted (empty chamber, of course). This allowed me to have two mags in my little "survival kit".
Just in case some one has not figured that out for themselves.