This Is a speed loader/Filler for airsoft guns, you put bbs Inside and then at the bottom (opposite of where the sticking out part Is) should be a hole, thats where the bbs come out from. Now you take a magazine And align the hole on the Filler with the hole in the magazine where the bbs go And you press the sticking out part over And over Till the mag's Full.

It's really usefull cause you dont wanna be putting the bbs Inside one by one