I have a Springfield M1 Garand, after field stripping and cleaning everything I reasembled the rifle and the front handguard is loose. There are not enough threads for the gas cylinder lock to screw onto to make the handguard tight. I manufactured a spacer to go between the front handguard and the gas cylinder assembly. I screwed down the gas cylinder lock and it is now solid. Is it normal for that front handguard to be loose? Am I doing a wrong thing by putting that spacer there? Any help. Thanks