help from at22 guys

[jamesob]

i am missing my mag for my at22 and have read that ar7 mags will fit if you make the catch hole in the mag. my ? is can somebody give me a measurement from the top of the mag to the top of the mag catch hole and the size of the hole. yes i know they still make mags for it but my brother gave me some of his ar7 mags so i can make these fit plus get 2 more rounds.