The Innovative Arms Super Fun Gun, also known as the SFG, is a one-off American submachine gun.
The SFG was made from scrap by Philip Woodell of Innovative Arms, a company known for their silencers. Everything on the weapon was hand-made except for the pistol grip, which from an AK and the trigger from an AR-15.
The SFG is a submachine gun with an integrated silencer. It accepts box magazines from the Ruger 10/22.