Quote Originally Posted by Antoni View Post
No-one has mentioned adjusting the dead volume of the pump.

I got one these pistols in the 70s after covetting my mate's one - I only had a crappy break-barrel at the time. I simply used the piston position adjustment to change the dead volume at the end of the pump stroke. The trigger was never very nice and it was certainly less nice after the adjustment. My point is, that indicates that an "adjustment' had indeed been made.
No adjustment option on the new pistols. The pump is a moulded plastic part.
This is why the "flat top piston" mod is popular. But as I mentioned above, mine is getting perilously close with the standard pump - don't need any more.