I've seen the threads on stiffening up the Axis stock and I may add that mod to the mix, and I know that a bit of elbow grease (or judicious use of power tools) and a socket or dowel and some coarse sand paper can open up the barrel channel ... but since I'm going to be buying a gun with the expressed purpose of putting a specific barrel on it I was really wondering if either the SR or the Heavy Barrel would already have the clearance to fit the ARP barrel. All three types (standard, SR, and HB) seem to fairly easy to find and are all similarly priced around $300 - $325. If either the SR or the HB fits my ARP barrel with the Savage magnum profile I'd rather go that route (and maybe have a slightly more valuable barrel to sell in the EE when I'm done) than to get a sporter profile barrel and know in advance I need to open it up.