Quote:
Originally Posted by John Reed
I honestly don't think the trigger mechanism itself is the cause of the doubling as the way it's designed, there is no way both hammer sears can be tripped at the same time. I honestly think the sear engagement on the hammers may be set too light and recoil is causing the doubles as it will not happen with snap caps or .410 tubes in the gun. The trigger pull is quite light for a shotgun. I'll pull the sears out tonight and tale a look at them.
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What we call "doubling" is almost never both sears coming out of bent at exactly the same time, but often the recoil from the first shot tripping the second barrel's sear. The reports are very, very close together and some inexperienced folks think it's both barrels at once. Another rarer, but possible cause is that the involuntary second trigger pull that we all do upon recoil is not being "accounted for" by the trigger, and is actually causing the second barrel to fire. This is a feature that is built into the trigger itself. Robertson and Adams, at Boss, developed the first mechanical single trigger that overcame this "involuntary pull" in the early 1890s. All successful mechanical single triggers have some method of accommodating this phenomenon.
In an inertia-shift single trigger the trigger is briefly disconnected from the sears altogether, and the involuntary trigger pull takes place during that brief time, to no avail. So, instead of the second sear being temporarily blocked, as it is with a mechanical single trigger, it is merely disconnected for a "split second".
I often to my own trigger work on rifles, pistols and some double trigger shotguns, but I don't mess with single triggers on doubleguns. Phillip Crenwelge, or Don Rackley, both in TX, handle that quite nicely for me.