GB/AC556 model site block/lug

slugger you might want to keep an eye out on Bowers board and Subguns for someone parting out AC556 Goverment models. Awhile back a guy with the handle of Jack from Public Safety had some AC566 parts kits on Subguns. You could make one or have a smith do it. Ruger won't sell these to the general public. Look on page 2 here under benEzras post about the gas block site, you'll see they can be made a fellow member (hekimian ) welded one up. Another member is talking about casting one also. Good Luck.