A switch near the trigger is set to single mode.
It weighs 3 kg. It is a rifle.
It's a two-handed weapon requiring skill in rifles.
It's a lightning-fast weapon.
It does slight bullets damage.
A skilled fighter could do somewhat more damage with this.
The American-180 uses .22 pancake magazines, available from BlastArms. It can be fired in single shot or automatic.
This is the best rifle to use for grinding, the ammo is cheap and on single it does shit for damage. But there's so much ammo it will jam more often than you have to reload it.