Poly Technologies Hammer Pin Retaining AKS Spring Black. Specifications for Poly Technologies Hammer Pin Retaining AKS Spring: Manufacturer: Poly Technologies Color: Black Gun Make: Kalashnikov Gun Model: AKS Fabric/Material: Steel Condition Quality: Excellent Condition Details: Other Package Contents: Poly Technologies Hammer Pin Retaining AKS Spring What firearm models does the manufacturer say Poly Technologies Hammer Pin Retaining AKS Spring is compatible with? The manufacturer says that Poly Technologies Hammer Pin Retaining AKS Spring is compatible with AKSPoly Technologies 70-00-37S: Hammer Pin Retaining AKS Spring Black