Oh...Sorry...Don't remember the specifics because I wasn't planning on being involved with them just that I read about them. If the ATF mentioned them then they must have "rules", probably saying , "You can't do that". Not wishing to make an even bigger *** of myself with a wrong answer suggest checking the BATFE web-site or available online regs'.
OR....Just build the thing and have a ton of fun out of sight and hearing of any LE what lacks a sense of humor.
5..4..3..2..1..launch spud !
