Thanks, that helps out some. I'm sure when I get the gun next week and take it apart to do the mod it'll make even more sence. One other question, does anyone sell a mag catch that's already been modified for use in the semi-auto so it'll take the full auto mags ? Could I just get a full auto mag catch and install it and not have to mess with my semi-auto catch or is there more to it then that. I'd really like to save the stock catch and buy a different one to install or modify , who sell them and approx. how much are they. Also, ammuntionstore.com had Thompson mags for $12.95/6 or more, has anyone bought any of them, are they good quality? CDNN also has 30 rnd. mags for just under $15 each and they're listed as Ex. like new, which would be the better deal? Thanks for all the help. I've wanted a Thompson 27A1 for most of my life and I'm finally getting one. I don't want to be disapointed in it when it get it. I really do hope that it works good, it's an older Auto Ord. gun, not a Kahr Arms so it should be ok. Talk to ya'll later.