Lock problem with a LH GPR

I have a LH GPR with what I assume (I know) to be a lock problem. When I use the set trigger, then squeeze the front trigger, the hammer only drops to the half-cock position. It happens every time. I've checked the fly & sear for burrs. Cleaned and used a dry graphite powder for lube. Even tried different lubes to no avail. Stoned the sear & tumbler for smoothness. Can't get the problem to go away. Any ideas? :: :: ::

 

[tucoblue]

If the lock is pulled down too tight it can force a slight bend in the lockplate. This can prevent the fly from making a proper alignment. If the fly is pulled off to the side a bit the tumbler/sear can catch at the half-cock notch.

 

[GPR guy]

Does this happen if you don't use the set trigger?

 

Does this happen if you don't use the set trigger?

No... if I use the front trigger only, the hammer drops all the way onto the nipple.

 

[2172]

Tuffy, had the same problem with my LH GPR flinter. Got a lot of good advice here on the board...here's what I did, and it worked for me: got the lock really, really clean...had the innards almost dry. Took 2 turns off the sear spring. Other suggestions that were good, but weren't what i needed involved using inletting black to see if the wood had swelled and was causing rubbing...one more thing, when I had the lock apart, I felt all bearing surfaces for smoothness, and discovered a kind of "hump" on one which I carefully removed with a Dremel tool...I don't think that was the real cure...I think the combo of a lighter spring on the sear and a really clean fly, et c. area did it for me.
Good luck...it really is a pain in the posterior..Hank

 

[TwoShadows]

Another suspicious area might be that when the lock is snugged up tight the arm on the sear might be digging into the wood on the backside a little bit. Single trigger would ride it through, but the kick of the triggers might not do it. It's a simple chore to relieve it a tad there...and much easier than dismantling the lock when it might be something as simple as a little tight wood.

 

Took 2 turns off the sear spring.

Hank... took your advice on the sear spring. I cut it down about a turn and a half. Also noticed a couple of grains of unburned goex imbedded in the wood where the bridle rests. Cleaned them out and with the sear spring adjustment it is working fine. I also have a LH GPR flintlock, but haven't had a problem with it.

Thanks for all the advice. With you guys around, who needs a gunsmith :: /ubbthreads/images/graemlins/wink.gif ::

 

[Zonie]

Thanks for all the advice. With you guys around, who needs a gunsmith

That's the neat thing about this site.
Chances are the gunsmith wouldn't even guess this would fix your problem.
We have so much knowledge here because almost any problem a person can have has been fixed by someone here.

Of course it takes more than just knowing what the answer is. People who know the answer are friendly enough to post it so that others will know.

A great group of people here, Ah Says!