i made one for my mp15-22 and ruger 10/22 and use both at a public range overseen by a game warden and have had police and gov workers shooting along side of me they think its cool and 1 officer is going to make his own--illegal no way just check the atf website--btw i do keep material from the atf website with me in case someone doesnt believe in the legality of it---check local laws too