Tokyo Marui
Tokyo Marui makes a small series of semi-automatic guns that fire by compressing the spring and releasing it as the trigger is pulled. These are mostly marketed at children in various colors, but Tokyo Marui has released black and silver editions which come in more professional looking boxes. The barrels create a short range hop-up effect. Tokyo Marui only recommends that a special .12 g silver projectile of theirs be used, and that it be loaded with a proprietary speedloader which holds 90 projectiles.