You need to get barrel's that are threaded for the A5/X7.... so here are some... and my favorite..... the best for it's buck is the CP, custom products barrel.... I have been playing 5 years used over 2 dozen barrels and own 12, I have 3 CP's.... the...
Go to your nearest car wash, they often have 40 gallon plastic barrels that they can't get rid of. That's where I got my (free) barrels from.
you can get barrels from a local chemical company that will get chemicals in 55 gallon drums. they have more barrels than they know what to do with and would love it if you took some of them off there hands. I would get the plastic ones it you can so...