Does anyone know if: I switch out the whole bolt carrier to a g&p one, will it still accept my normal king arms mag? The g&p magpul pmags will work at all(magwell compatibility)? My gun will accept gbb or aeg barrels (I've read conflicting stories)? Which kind of inner/ outer barrels should I look at? I want to get the length of about an mk11 model 0/m110.