Amt Standard Firing Pin Spring
and screw. This will convert your pistol platform in to a SMG style platform. AR15 carbine rifle kit. High Standard Upper Parts Kit includes ejection port cover ejection cover hinge pin ejectrion cover hinge pin clip ejection cover spring forward assist. Home About Us. High Standard AR M4 Carbine Kit High Standard High Standard. Not responsible for typographical errors. Pistols Rifles Services. The M1.