recently had a debate about A5 barrels on TPXs...
To make a long story short, my team pistolero experienced it and, despite the slight accuracy improvement, he decided that it's not worth ruining the look'n feel.
he also tried stock BT4 barrel (wich -in my opinion- are more than similar) and found out that the BT improvement was somehow better, but again, nothing that can change your life.
but he never broke anything.
so if you're sing A5 barrel just for the look, it's not a real problem as long you ensure these are stock A5 barrels!