I am considering ordering one of the RRA 9mm uppers, and the rest of the stuff to make it work. But, where are the mags that fit these? I've seen lots of sten mags for sale cheap, will they fit? If not what do the mags for these types of kits run? Thanks.
Colt, $150, and hard to find
SA contract mags, $30, CDNN
Modified Uzi mags, variable price
Some members are making custom blocks to work with sten magazines, but it could be a while