There's also the "Kraut Space Magic" gun aka the G11.
The most overengineered gun perhaps ever in mass production. It literally picks up the bullet, rotates it, and then inserts it into the chamber to fire. And it uses caseless ammo for reasons far beyond human comprehension. It is magic because of how infrequently it jams.
It is also used by the UN troops sent by SEELE to invade Central Dogma in End of Evangelion.