The coolest part of the Tokyo Marui M870 is undoubtedly its ability to shoot 3 and 6 shots. TM has just developed this feature and you can use one of them on a single shell. One shell has a capacity of 30 BB and this shell does not require a new shell until it is finished. You need to pull and install it for each shot. Just like it really is. The gas tank is unfortunately not on the shell because you cannot make it with a single shell for up to 10 shots. Just like filling the GBBE magazine into a special gas tank in the stock, you need to fill the gas for 10 seconds. With this tank, you can easily shoot 100 shots in 3 modes! all you have to do is have a few more shells. Its heavy structure makes it more realistic and when you put it on your shoulder, you immediately feel the feeling of reality. The shot sound is pretty good. But the feeling of setting up ... the best part of this gun is the sound it makes when you rack it. When you pull the crown, the sound will make you feel like you're really using shotgun! Since it has a tactical structure, it will look better with a small red dot. If you take it on your back with Sling, CQB will be a great side gun for use in areas.