It worked for my buget rifle - Matrix Arms 5.56mm Stripped Upper Receiver

Had to replace my Ruger upper, fit was a little sloppy to my lower but with a little wedging it’s solid. Only 100 rds with it and performed great. It probably should have been lapped because the face was half flat and anodizing buildup on other half but my grouping was 1” and I’m happy with the purchase.