I really want a GSG but I'd have to shoot A LOT of .22 to justify the gun and then the $200 for a stamp and then $200 for barrel chop, threading and engraving.
It's not as bad as you think. Talk to jeffsoward, he SBR'rd his GSG. He chopped the barrel himself & used a gemtech 3 lug threaded adapter ($50) to mount a spectre.
GSG SBR