A mini (also called mini electrics) are airsoft replicas of full-sized rifles such as an M16 that are shrunk to the size of a pistol. While many airsofters consider these guns to be cheap, there are some players that like them.
The average mini has about 115 FPS, costs about $30-$50 and is about one foot long. Minis are usually fed not from magazines, but from non-working scopes and acessory rails.