I am not sure when this was done. I found it on the brochure designers portfolio page (seanrose.com). It lists three barrel configurations. Is this old news?
Both the 7.62x39 and 6.8 SPC would require a different bolt, barrel and magazines to work. If you wanted to use AK mags in the ACR with the 7.62x39 then a new lower would be required as well. Cproducts does make 7.62x39 mags that fit in the AR mag well, but they are not know for their reliabilty.i could be wrong but it will require a different lower/bolt/barrel...anybody's thoughts?