Precision Rifle Barrels Which Precision Barrel Is Better For My M4?

Which precision barrel is better for my M4? - precision rifle barrels

I am looking for either an inner cylinder or MadBull 6.03mm Tanio Koba (the series of slots precision barrels looted the gyro spin) and wondered if anyone here has used Tanio Koba M4 barrel. I've seen what can MadBull barrel and I am impressed by the question of whether the place of traditional knowledge, better.