GPR Set Trigger Sensitivity

[jpm1963]

Was out shooting my GPR today, generally went well as normal except that after about 7 - 8 shots my set trigger seems to get more sensitive. Almost like it will go off without touching it.

Do you think I just have it set too touchy, or is my 15 year old gun in need of some TLC?

I own another Investarms "Hawken" with is set less sensitive, no issues with it . . . So I am thinking I just need to make it less sensitive with the adjusting screw.

 

[Griz44Mag]

Do you think I just have it set too touchy, or is my 15 year old gun in need of some TLC?

. So I am thinking I just need to make it less sensitive with the adjusting screw.

That's what I wound up doing with my 40 year old Thompson Hawken. No issue now. Works as expected.
Griz

 

[Zonie]

It sounds like you should unscrew the adjustment screw between the triggers.

One full turn or two to be on the safe side should do it.

 

[Hawken-Hunter]

My trigger became too sensitive. I considered it borderline dangerous. Trigger adjustment screw didn't work. Took it to a gunsmith. Turned out the trigger edges up inside the lock area were worn, needed a new trigger.

 

[Grimord]

Those adjustment screws tend to work their way out after awhile. Once you get it re-adjusted to your liking, I suggest you put a drop of nail polish on the threads to keep them from moving. You will still be able to adjust the trigger if you need to cause the nail polish is not permanent. You will have to put a new drop of polish on the threads should you change the adjustment.

 

[robinsroost]

I suggest you put a drop of nail polish on the threads to keep them from moving. You will still be able to adjust the trigger if you need to cause the nail polish is not permanent.

I generally agree but I use a drop of blue locktite instead. Keep yer powder dry..........robin :idunno:

 

[jpm1963]

I'll adjust this weekend and apply loctite . . .

Will advise if that does not seem to revolve it.

JPM

 

[Grenadier1758]

Use blue Locktite. The red can be a permanent lock.

 

[Mr. Troll]

A drop of cheap super glue works just as well as the loc-tite on the threads, and is a whole lot cheaper, too

 

[jpm1963]

Whats cheaper is that which is already sitting on the workbench, as the low strength loctite already is . . . use it often.

JPM

 

[Mr. Troll]

Just offering an alternative. Most people have the cyano-acrylic cement lying around for other uses, anyway.

 

[jpm1963]

I usually have both around and a variety of other adhesive choices.

JPM

 

[jpm1963]

Got around to tinkering on this today.

The issue was not the adjustment screw, but a small set screw under the trigger mainspring which seems to put upward pressure on this spring. It was backed out a little. I gave it a turn inward and now all is well. A drop of locktite should keep it that way.

Odd that this screw does not show on the current Lyman GPR instruction PDF from their website.

Anyway, learned something new.

JPM

 

[SgtMaj65]

Mine came out of adjustment after about 100 PRBs. I had used nail polish on threads, but, like you said, it's not permanent. I'll probably just drop some nail polish on my Renegade set screw every few range sessions now. I've really gotten to like using the double-sets at the range. Much easier to paint the center of my targets now.