umm to use the hi cap mags with this LEGALLY you need 10 us made parts like tru said. on saiga-12.com forum they have a whole section dedicated to the pistol grip conversion and making sure its 922r compliant. i believe the magazines themself have 2 us made parts, the magazine body and the follower. you can change a number of things with us parts like the gas piston, fire control group, buttstock(i think counts). however if you just bought the hicap mags they just go right in. these guns in order to be imported to america had to be "sporting rifles". so the izmash factory made them just "sporting" enough to make it to america. these receivers were made to be converted from sporter to pistol grip assault rifles to be honest. not very many people leave them "sporter" i however went for a more saiganov(dragunov) look.

here is a converted saiga308