with C-PRODUCTS coming out with AR/SIG556 pattern mags in 5.45 cal. does anyone else think this a do-able conversion -a modest opening of the bolt face would be needed, maybe a different recoil spring , just looks like with the cheap ammo around it might be a money maker-I am willing to go, say $300 or so for a barrel(of course a spare bolt would be nice!) anybody willing to step up and start building?