The UHC spring revolver refers to a group of Single action action (Spring) Revolvers With a revolving cylinder holding 6 rounds. All UHC spring revolvers are made to fire .12 gram or .20 gram 6mm plastic BBs and can also fire 6mm paint balls. What makes this gun unique is the plasic (Reusable) .357 magnum shells. Currently as of 2010 there are 3 models of All sporting similiar Accuracy, Firepower and over all performance. All variants come in different size barrels 8 inc, 6 inch and 4 inch some even come in 2.5 inch snubnose. and all come in either black or silver.