Unless you had the original Microchange version, I think that vintage Blaster is the same as the reissue. Maybe some fall or the toy being knocked about during play leads to the spring and the door mechanism becoming unaligned. It's easy to see how that can happen when you open him up. It may not happen to reissues because as adults we are more careful with it.
Prime is really the only toy that differs considerably on the inside of his arms when it comes to his reissues and even some of his vintage variations.