Grab both sides of the gun and pull forcefully in an upward and outward motion to remove from the light green stock.

If this is your first time disassembling your gun, the stock will be glued to each half of the gun's body. To break off the stock from the frame of the gun, you will need to careful wiggle the two halves so that the glue will break apart. The plastic on the gun may break or warp slightly.