Armaspec AR9 GEN4 9 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 AR9 GEN4 9 Stealth Recoil Spring Buffer Kit: Manufacturer: Armaspec Color: Stainless/Black Gun Model: AR-9 Condition: New Country of Origin: USA Features of Armaspec AR9 GEN4 9 Stealth Recoil Spring Buffer Kit Coming Soon Package Contents: Armaspec AR9 GEN4 9 Stealth Recoil Spring Buffer Kit What firearm models does the manufacturer say Armaspec AR9 GEN4 9 Stealth Recoil Spring Buffer Kit is compatible with? The manufacturer suggests that Armaspec AR9 GEN4 9 Stealth Recoil Spring Buffer Kit is compatible with AR-9Armaspec ARM263-9: AR9 GEN4 9 Stealth Recoil Spring Buffer Kit SS/Black