The following guns were used in the movie "I Am Number Four"
Human Weapons
Remington Model 870 Shotgun
Sam brings a Remington Model 870 Shotgun when he and John go to the conspiracy theorists's house to save Henri, only to be told to stay in the car. The weapon changes hands several times before Henri empties it into a Mogadorian.
Remington 870 Police Magnum Riot Shotgun - 12 Gauge
Sam holds th shotgun in the truck. The magazine tube end cap is visible, confirming the weapon's identity.
One of the conspiracy theorists holds Sam hostage with the shotgun.
The shotgun fall s to the floor after John uses his telekinesis on the man..
M79 grenade launcher
Number Six carries an M79 grenade launcher when she shows up at the school and discards it after firing the wepon's only round. The M79 fires a fictional energy grenade round.
M79 grenade launcher - 40x46mm
The M79 is seen as Six walks through some smoke as the makes her entrance. The weapon is broken open, suggesting that she has just loaded the weapon. Her pistol is seen holstered on her left side.
Six brings the grenade launcher up to her shoulder after snaping it shut.
Special
Six handles the M79 in a behind the scenes shot from the "Becoming Number 6" featurete
Energy Weapons
Six's gun (Lorian pistol)
Number Six carries a Lorian energy pistol which, since she's a good guy, fires blue energy rounds. She draws it after discarding her M79 and uses it hor the duration of the battle in the school.
Number Six opens fire with her pistol. It's hard to get a clear shot of the weapon, since it's either dark or the firing effects obscure the gun.
Six aims her weapon from the cover of a locker.
Special
Number Six aims her pistol in a behind the scenes shot from the "Becoming Number 6" featurete
She holds the gun as she practices stabbing a Mogadorian, and gives a nice view of the weapon.
Mogadorian Assault Rifle
Mogadorian Carbine
Special
Mogadorian Glove Rifle
Mogadorian Heavy Blaster
Energy Cells