Theoben GP .177

[GSMN1]

Jon. Just popping out but quick photo reveals a hex bolt on the upper front section of the trigger. Is that what you’re referring to? https://imgur.com/gallery/B81IS

[GSMN1]

If you can access the image on the last post...
Does anyone have any idea on what bolt does what?
Would like a rough idea before I start fiddling.

[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