My ignorance of platforms other than .223 is going to show now. On a .308 upper, like an AR10 or LR308, besides the obvious caliber difference, are the barrels a different form factor than a 223 based upper? I ask because I was wondering if one had say an LR308, could one simply place an MGI 450B barrel on it to change to 450B? The 308 bolt is already .473 rim diameter like the 284 parent cartridge. I imagine one would have to fabricate a magazine insert to restrict the travel of the cartridges as a result of recoil.
Thanks,
Hoot