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Merkel Rear Trigger Problem I hope someone has a solution to this problem…

Subject: Merkel 140AE double rifle. I posted in the more frequented shotgun forum since this is a trigger problem.

Problem: Double trigger boxlock ejector Merkel 140 AE rear trigger increases from 6 pounds to almost 12 pounds after a few shots. I fire this gun by alternating the barrels right to left. On my 16th shot (attempt) I could not pull the trigger.

I took the gun to my gunsmith who disassembled it and set the triggers to 4 and 6 pounds.
Next time shooting with less than another 15 rounds, the rear trigger suddenly increased to almost 12 pounds.

Back to the gunsmith who disassembled and inspected it for a possible cause to include possibly the stock binding. He could not find anything.
Reassembled and return to range. Once again after relatively few shots fired from each barrel, the rear trigger suddenly increased to almost 12 pounds.

Has anyone seen this problem before in any boxlock rifle or shotgun?

Wow that's a tough one ,can't wait to hear the solution.could it be a linkage problem with the safe.cant imagine it getting hot enough to effect the trigger.

It could be a sear problem.

Could be the scears. Did the mechanics stone the scears? What about the Safety? Is it automatic? Can you take it out of service & try?

Serbus,

Raimey
rse

The problem first occurred prior to anyone opening up the rifle.
The gunsmith checked the safety, it the wood maybe had caused it, the triggers and sears but found no evidence of anything wrong.
He adjusted the pulls to a crisp 4 and 6 pounds.
Firing the gun again everything was great until a dozen total right and left barrel shots.
Then, "presto", a 12 lb pull was once again required for the rear trigger.
Back to the smith for another inspection. After nearly an hour he found nothing.
Pulls were 4 and 6 once again for less than a dozen shots...
Now, I am seeking information from all...

Thanks!!!

I wonder if the problem would be caused by dry firing on snap caps or spent cartridges. Not because I have a specific mechanical problem in mind, but because if so it would allow cheaper and more convenient testing of any interventions.

In other words,
The rear trigger jumps from a 6 to 12 lb pull required.
The stock and trigger plate are removed to inspect for anything abnormal. Nothing found, twice.
Reassemble the gun and like magic, the rear pull is back to 6 lbs.
Shoot each barrel half a dozen shots, more or less, and the rear trigger pull suddenly jumps to 12 lb.

We did put a trigger gauge on the rear trigger when it was/is heavy.
The weight varied from 10.5 to 12 pounds. Maybe this indicates something like two parts (sears maybe) rubbing against each other?

Thanks in advance!

I sure cannot even guest, but if GSI is still the importer for Merkels, I would give them a call for starters. Long ago I had my nearly new Merk doubling on me and they took it back and did a little work as well as replaced some parts which solved the problem.they may have some ideas.

Mark,
I'm wondering if the action heating up from firing is causing some sort of binding. Just a thought.
Karl

Being >>Captain Obvious<<, the issue is recoil dependent. I wonder if somehow on of your fingers is affecting the performance?

But I would remove the Safety, or disengage it if possible, & see if the situation repeats. How much recoil are we talking about?

Serbus,

Raimey
rse