Sig Sauer GSR Co2 BB Hunting Pistol 4.5mm .177 Cal Metal Slide - Tophatter's Inc. Weapons Store OnlineThe Sig Sauer GSR is an excellent gun for plinking in your backyard. This CO2 powered pistol has an all black stainless steel slide and comfortable grips for a smooth and comfortable shooting experience. Fire 21 shots as fast as you can pull the trigger. The gun features powerful semiautomatic firing, a working safety, and a Weaver Picatinny tactical rail under the barrel for mounting optional dot sights & flashlights. This pistol also has a metal