OK, I know it's not a REAL Enfield but it's a variant. I have an Australian International Arms M10-A1 rifle chambered in 7.62x39 and every time I fire it the bolt handle rotates up and completely unlocks! The bolt does not travel to the rear but the handle does go all the way up. I have only fired steel case Russian ammo and the cases are not showing deformation of any kind. If I put my thumb on the bolt handle when firing I can feel it push up but it is not a hard push. I have noticed that when I dry fire my No4's the bolt handle rises. Is this a headspace issue or something else? I am afraid to shoot the rifle and that saddens me, it is too pretty to be a wall hanger.