This handguard will fit gen 1 Galil Ace models with a long single screw to connect mid handguard - found on the 762x39 and many 556 models. I bought the wrong handguard, (mine was the other model), so selling it at a loss unused.
Link for details: https://midwestindustriesinc.com/mi-galil-ace-7-62x39mm-handguard-m-lok-tm-compatible/