well, if there are 5/20's out there not welded, then cutting the welds would render mine as a match to those, so that should be OK. and any pinned/riveted mag is easily converted, isn't it? as I read the law, I do not see the words "easily converted" anywhere -- it's black and white -- how many rounds does it hold?
I just wish I knew why they were welded in the 1st place, I am not sure what I will find when I open them up . . . I am assuming they have an oversize follower to occupy the space of 15 rounds.