Here's a personal experience I'll share with you.
I've had two friends that have had repro single trigger singleing problems. Two different guns, two different trips but the same problem. In both cases we were in North Dakota pheasant hunting and the weather was cool let's say 32f & the guns had been working fine when the temp's were warmer.
I always carry some basic gunsmithing tools with me on trip's. So in the evening I pulled the trigger plates off of these guns and determined that the original lubrication oil had turned to varnish over the years. All it took to get the triggers back in action was to spray the trigger mechanism with some break kleen to dissolve the old oil and then lube them with some lite oil.
Here's my take on the repro's right or wrong.
Even the newest of the repro's are going on twenty years old now. That means the factory lubrication is also twenty years old. One of the unfortunate facts about most lubricants is they have properties in them that evaporate and the oil turns to varnish. So even if you have a new unfired repro it could have lubrication problems if you were to start shooting it. If you haven't done it yet, you should have your repro dis-assembled, properly cleaned & lubed so you can have a long lasting reliable gun.
I'm seeing more and more posts on the different sites about repro single trigger problems and I wonder if most of them are caused by lubrication issues. These issues could be either as I found with dried out lube gumming things up or possibly the lack of lube wearing out or galling fine fit parts.
Just some food for thought based on my experiences!
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