Theoben GP .177

[Shed tuner]

sorry Geoff, the one I was thinking was the latter trigger on the Evo. I can't remember how my long departed GP trigger adjusted

[Ragle Jnr]

Had fun with mine too! Eventually found this on bbs and also a tip to only turn ⅛ of a turn at a time. Now very happy.

Turn screw clockwise for heavier second stage, however if the adjustment has been reset incorrectly this may not be the case, at this point you have to get back to a base setting which does seem to confuse most people.
It may also need some work other than adjustment as it could be as much as 15 years old.

Ben

David

[GSMN1]

Avid was yours the version with the hex bolt on the upper front face of the trigger? Thanks Geoff

[landymick]

Its around March 1987 I think.

[Ragle Jnr]

Hi Geoff, yes mine has a single Allen screw in the front of the trigger and a push forward to release safety catch inside the trigger guard. Airgun forum confirms landymicks date of 1987. Enjoy! David

[GSMN1]

Right then i will start with clockwise rotation of said hex bolt and will go canny as they say. Mine is the version with the pull down safety in front of the trigger guard. Same as the one on the John Walters Airgun book vol 4. BTW the serial number is hand scratched in, is yours?

[maximus]

Hi the trigger on your gun is not the Evo trigger, I believe it is based on the Webley omega design. A Google may reveal how to adjust. I had a Countryman with the same trigger and they can be made very nice. Atb Max

[maximus]

Hi the trigger on your gun is not the Evo trigger, I believe it is based on the Webley omega design. A Google may reveal how to adjust. I had a Countryman with the same trigger and they can be made very nice. Atb Max