GLOCK pistols equipped with the MICRO RONI G4 stock system are seen here. The polymer and aluminum system transforms semi-automatic pistols into useful carbines for self-defense, sporting clays, and tactical operations, among other things. After being placed in the MICRO RONI G4 stock system, your weapon retains its legal status as a handgun; it may even be used when the stock is folded in for concealment. Assembly may be accomplished in a matter of seconds with a little skill and patience.