From carbine to full length
What would i need to do for this change, just barrel and gas tube. I thought i would like the carbine length of hand guard, but now i think I would prefer the longer length. Where would be a good place to get diffrent barrels without breaking the bank.
Moving to Build it Yourself.
If you want the front sight base at the rifle length and a low profile gas block at the carbine or mid length position then you could buy a Dissapator barrel. I don't know if Spikes or Palmetto will sell just the barrel, but CMMG does (expensive though).
If your current barrel is not a light weight barrel, you could get a Armalite Clamp On FSB and convert your barrel to a Dissapator. While not as strong as a pinned front sight base, the clamp on is pretty damn rugged.
If you just want the longer grip/hold then you can put on a longer free float hand guard in however long you want it.