Hi

I bought a 50 action that came with a spare (Brand new) Export spring! It's mahoosive!! I can recall respringing an old type 01, That was easier than the standard 50 due to not having the three ball sear but the spring I fitted was an Ox

That was some years ago, I sold the gun to a mate, He sold it to another mate, Eventually he asked if I wanted to buy it back, The price was double what i'd sold it for a couple of years before!!

I would hate trying to fit the hugely long mainspring in to a standard mod50


John