The Kaw Valley Precision 9mm BCG is a feature packed solution for your 9mm Blow Back Carbine or Pistol. The KVP 9mm BCG is compatible with either Glock or Colt style magazines. The carrier is constructed of US made 8620 steel, with a Nitride QPQ finish. The QPQ finish offers excellent wear and weather resistant properties that are superior to lower grade phosphate finishing processes. KVP also added a beefier firing pin retention spring to help lower the likely hood of firing pin breakage, that is common in other 9mm BCG's. FeaturesGlock or Colt Compatible8620 Steel Carrier ConstructionNitride QPQ FinishHeavy Firing Pin Retaining Spring