Bought one yesterday for my sins, missing it's open sights, but shoots quite well, the trigger is excellent, made in Hungary stamped. How do you know if it's an early one or later model and what years were they produced. Hoping to swop Spring to a Titan no7 shortened and fit a guide somehow? would rather keep the leather piston seal maybe soak in neats foot oil, the replacement idea is a bit pricey considering the value. It seems well made by today's standard. Any other ideas apart from binning it would be appreciated