Originally Posted by
Geezer
Mk1: rounded stock, pull-forward barrel release (copied on the Webley Omega).
Mk2: squared stock, clutch lever barrel release (copied from 1970s Walther LGV).
They were sold in the UK as 12 ft-lbs models but usually made more like 10.
The 335S (both variants) was a German-market sub 7.5 Joule (= roughly 6 ft-lbs) starter 10M target model with a weaker spring, often sold with an aperture rear sight.
We have had some debate on here about the front stock mounts being prone to shearing. Many say that happens, especially if amateurly over-sprung to raise power. My example has that. Others have had different experiences.
Worcester Black Powder Supplies did a custom one in 1984 or so (the Marauder) which by all accounts at the time was very good.