Original 75

[Graemevw]

Addendum to my earlier post. I decided to browse teh earlier posts and saw the mention of both piston heads being the same. This is something I do, because the usual replica and indeed genuine compensation head is smaller ???? than the actual piston and causes metal to metal friction. Original obviously thought this was ok, but I'm from an engineering background and that is a no-no. So I always fit compression heads to both pistons, it smoothes the action a little and solves the contact issue. If I or my friend serviced the gun we would have put a logo and date inside the stock, if it's me look for HRH plus date. Again pm me if if it has.

I didn't notice anything inside the stock, but I will check.

As for the seals, I did notice the rear one was smaller than the front. I had the same immediate concern as you, about possible metal to metal contact. But the smaller seal is still larger in diameter than the piston so figured it would be ok. It is looser in its cylinder than the front one though but the rear piston doesn't compress any air.
I can only assume they did this so there was less resistance in the movement of the compensation piston than the front. I wonder if it was maybe an unnecessary action to help lock time. I can see that the more friction the slower everything will move. I doubt a tiny bit of seal friction would make much difference but sometimes things are designed on hunches rather than facts.
It does seem to have a faster lock time than my walther lgr.
The gun had blue seals, and they were fine to be honest. But as I'd already ordered new seals I fitted them anyway. I could put the old compression seal on the rear piston, but it shoots great now so I probably won't go through all the effort of stripping it again.


Edit... pm sent