[lugerholsterrepair]

Glenn, As Don indicates, might be a weak hold open spring. This flat spring holds the knife edge of the hold open down into it's foxhole until the magazine follower button pushes against it after the last round is stripped from the magazine. . If this spring is weak..it's possible that recoil can cause it to pop up and catch the slot under the bolt. It's the first thing I would suspect if you have premature hold open problems.