HK parts sells these cut up for $1500-$3000 all day long(http://www.hkparts.net/shop/pc/MP5-Parts-Kits-Flats-Jigs-c86.htm). Are you required to send these somewhere, or dispose of them once cut up? I am in the market for HK parts kits if you know how I might get my hands on some.
I was thinking the same thing.