Q. What magazines does the HAC-7 family use?
The HAC-7 family was developed using modified AR-10 magazines. H.A.C. was supposed to produce their own steel magazines, but none were produced. The AR-10 magazines that remained after the disolving of H.A.C. were sold to Knight Armament, who incorporated them into it's SR-25 (hot rodded AR-10) product.
http://www.biggerhammer.net/hac7/faq.html
heres the owners manual:
http://www.biggerhammer.net/hac7/hac7_manual/
heres the board:
http://www.biggerhammer.net/hac7/wwwboard/
i will trade you a bottle of scotch & a box of HoHos for it
its worth about 2Kbucks US