Krieger Folding Knife, Assisted Opening, KG228 DAMASCUS – Optic Ready Slide with – Optic Ready Slide with Removable Rear Sight Plate– Pistol Uses Both CO2 or Green Gas Magazines (Alternate Magazines Sold Separately)– Field Strippable with Similar Balance and Weight As the Real M17– Metal Slide Construction with Full Blow back Action– (1) 21rd Metal Magazine– Caliber 6mm Plastic BB– Replica of the US Army M17 Pistol– Up to 410fps (CO2) 320fps (GG) smooth deployment – every time The handle has tightly secured It has a 4” stainless steel blade with a non reflective black finish that can be smoothly deployed with assisted opening