Centennial Defense Systems Stainless Steel Billet Firing Pin Assembly w/4lb Spring for Gen 1-4 Glock 9mm .380ACP Nickel. It is designed to be a direct replacement for your Glock and does not require any additional fitting. Fits: Gen 1-4 Glock 17 17L 19 26 34 Does NOT fit: G42 43 43X 45 48 19X or Gen 5 models Note: Factory spring weight is 5.5lbs. Spring weights under 5.5lbs are NOT recommended for duty or carry use. Specifications for Centennial Defense Systems Stainless Steel Billet Firing Pin Assembly w/4lb Spring for Gen 1-4 Glock 9mm .380ACP: Manufacturer: Centennial Defense Systems Gun Model: Glock 34 Glock 17L Glock 17 Glock 26 Glock 19 Caliber: .380 ACP Package Contents: Centennial Defense Systems Stainless Steel Billet Firing Pin Assembly w/4lb Spring for Gen 1-4 Glock 9mm .380ACP What firearm models does the manufacturer say Centennial Defense Systems Stainless Steel Billet Firing Pin Assembly w/4lb Spring for Gen 1-4 Glock 9mm .380ACP is compatible with? The manufacturer suggests that Centennial Defense Systems Stainless Steel Billet Firing Pin Assembly w/4lb Spring for Gen 1-4 Glock 9mm .380ACP is compatible with Glock 19 Glock 26 Glock 17 Glock 17L Glock 34Centennial Defense Systems FPA-GLK-14-9MM-4LB-NKL: Stainless Steel Billet Firing Pin Assembly w/4lb Spring for Gen 1-4 Glock 9mm .380ACP Nickel