Quote Originally Posted by TonyL View Post
Yep, bearing in mind that it's using the older style piston, Paul (shorter stroke) and with the stroke further reduced by the 'O' ring head, I'm guessing very efficient.

Sorry to hear of your missing 'O' ring. I hope you manage to get one quickly so that you can get the 100 running as it should.
I'm wondering if my reduced & revolving piston HW80 is an O ring, not had a chance to strip it as there has always been something else in bits. I bet it's the work of someone on this forum. It's running just over 9 ft/lbs & I'd like to up that a tad for long range shooting. I'm thinking it's more likely to be seal wear than the spring.


I've got all the O rings for the 100, the missing ring was how it was when I got it. I was watching a strip & rebuild you tube when I spotted the ring on the youtubers valve which isn't there on mine.

The parts & respective rings are all laid out now ready to be fitted.



.