I have a Silver Bullet Double Barrel...works great as long as you remember it is like running a double coil when you run two single coil cartos, trying to run two dual
coils buts a heck of a draw on the battery.
I also bought one of the dual cartomizer adapters, partly for the fun and partly just for the tip which fits my Silver Bullet double barrel.
I put a couple Ikenvape 1.5s on it and it does make good vapor.