Features: ONLY for use with MI AK Alpha Series handguards (MI-AK-ALPHA6, MI-AK-ALPHA10.0) Not compatible with other Midwest Industries generations or other manufacturers' products Patented components provide accurate return to zero solution for existing AK firearms Features adjustable locking block to fit on most 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 and two steel stability struts for a solid lock up Maintains factory rear sight with lower 1/3 cowitness sight picture 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 stability struts are laser cut 4140 steel Weight: 9.7oz Made in the USA Multiple patents pending Lifetime warranty