What flavor barrel do you have on now? OAL and gas port length?
What are you planning on doing with it?
Seems you are putting the cart before the horse.
Can you post up some pics of your current barrel?
HBAR means listed as such or has a .750" diameter from the receiver to the gas port and ideally no further cut down sections up to the muzzle. Note the 14.5" Colt Socom barrel is approved by the MSP as HBAR and has both the grenade launcher cut outs and reduction for the mount up front. It's much lighter versus a full 16" HBAR and still has a good accuracy record. I swapped out a 16" PSA HBAR barrel that shot fine and I paid $75 for and don't regret it.
Not sure yet. Got it with the built upper for Sub Moe Target. But was told it is an HBAR 16" 1-8 twist .750. But IMO looks like a "government profile" it curves down just after the gas block and goes back up. I do not have any pictures of just the barrel.
I just what a good MD compliant barrel and for the money the Faxon looks good.