Armaspec AR15 GEN4 H Stealth Recoil Spring Buffer Kit SS/Black. To eliminate any potential failure points we changed the screw to a roll pin across the plastic end piece and the cap is machined on the rodm replaced the snap ring with a washer. Specifications for Armaspec AR15 GEN4 H Stealth Recoil Spring Buffer Kit: Manufacturer: Armaspec Color: Stainless/Black Gun Model: AR-15 Country of Origin: USA Features of Armaspec AR15 GEN4 H Stealth Recoil Spring Buffer Kit Coming Soon Package Contents: Armaspec AR15 GEN4 H Stealth Recoil Spring Buffer Kit What firearm models does the manufacturer say Armaspec AR15 GEN4 H Stealth Recoil Spring Buffer Kit is compatible with? The manufacturer suggests that Armaspec AR15 GEN4 H Stealth Recoil Spring Buffer Kit is compatible with AR-15Armaspec ARM263-H: AR15 GEN4 H Stealth Recoil Spring Buffer Kit SS/Black