I recently got myself an Armalite AR10B. It's a 16 inch, which is what I wanted, with the factory barrel in it. I haven't taken it out to the range yet to see how she groups but spitballing ideas, I've thought of replacing the standard near pencil profile barrel with something more substantial while still remaining (preferably) at 16 inches, as I bought the thing to be a sorta 800 and in DMR type build. The problem, as I'm sure people familiar with the ar10 are, is you can buy an Armalite barrel for it for about $250, or go all the way up to premium barrels, all of which are north of $600 with the entire mid range being made up of DPMS pattern barrels. My question became, could a qualified gunsmith take the current barrel and a decent dpms pattern barrel, swap the barrel extentions, headspace the bolt and replace the gas tube and have a functioning firearm with the same bolt and reciver set? Or is a DPMS barrel only ever going to be good with a dpms bolt? As an E-3, I'm trying to make the most of what I've got, especially consittering the price (and sometimes lack of quality) that AR10 parts have sometimes.