LOOKS LIKE I MAY NEED TO INVEST,TOO BAD ASS NOT TO FOR THE PRICE, GREAT DEAL...THEY EVEN MAKE A 18". THEY ARE ALL SEMI-MAG FED!!!
http://safetyharborfirearms.com/ind...ppers/shtf-50-mag-fed-upper-conversion-detail
http://safetyharborfirearms.com/ind...ppers/shtf-50-mag-fed-upper-conversion-detail