ONLY for use with MI AK Alpha Series Krink handguards (MI-AK-ALPHA-BKM MI-AK-ALPHA-BKQR) – Not compatible with other Midwest Industries generations or other manufacturers’ products – Patented components provide accurate return to zero solution for existing AK firearms – Midwest Industries recoil spring button made specifically for AK Alpha Series top cover – Extremely rigid lockup ensuring dust and dirt does not enter firearm – Utilizes two aluminum struts for a solid lock up – Integrated rear sight allowing you choose an optic or basic setup – No permanent modifications needed for installation on MI AK Alpha Series handguard or firearm allowing user to put firearm back to stock form if desired – Top cover and main stability struts constructed from Hard Coat Anodized 6061 Aluminum – Steel locking block made from 4140 steel – Made in the USA – Multiple patents pending – Lifetime Warranty – Compatibility Disclaimer – Made to fit on most AK Krinks such as PSA and Riley Defense