Beretta PX4 .177 Magazine Pellet/BB

It sure makes a lot more sense to have extra mags you can load over a table or counter before you hit the range than taking a bottle of BBs with you and risk spilling them on the ground as you fumble around on the firing line. They aren't expensive, so it makes sense to get a couple magazines and take care of loading BBs before trigger time. This is compatible with the Umarex Beretta PX4 Storm. It has a capacity of 16 BBs/Pellets with a twin rotary magazine.