The Beretta A400 Xtreme Optifade is the optimal camo for this gun (my opinion). But since you are looking to replace your existing Beretta A400 Xtreme Optifade Barrel we probably think alike. This is an Original Beretta Part. The barrel is 28" the perfect length for waterfowl hunting - not too short to impede on your swing and not to long to be heavy and cumbersome in the blind. 12 gauge Chambered: 2-3/4", 3", 3-1/2"