In our opinion this is the coolest gun to debut in airsoft since the fully auto rifles first came out over two years ago. This thing is super cool. You will need to purchase the caps below to fire the gun. It WONT shoot without caps. This gun is called the M2037 and is an M16 Replica. Load several bullets seen in the above picture with a cap and a BB for each bullet. Load the clip like a real gun with these bullets and fire away. On each fire an empty shell will eject out and smoke with come where the bullet ejects like a real gun!!! Gun comes with just over 20 bullet shells but extras are available. You can use them over and over, you just have to reload the shell with a new cap and BB for each bullet after it has been shot. As if its not cool enough already these come with a tactical laser mounted on the front, extra clip, and shoot an astonishing 350 fps!!!  These are not recommended in an airsoft war with friends because they take more time to load the shots than normal guns. Battery does not come out of gun to charge, instead there is a place on the gun you plug the charging cord in.