LOP translation between single and double triggers
 

Hello,

I had the chance to handle a Parker reproduction 20ga today that had a 14 1/4 LOP to a single trigger. It seemed to fit surprisingly well considering I usually prefer a LOP closer to 14 7/8.. I only own double trigger guns so im curious when you measure a single trigger gun how do they correlate?

The single trigger Repros position is at the location of the forward position of a double trigger gun effectively lengthening the LOP for the shooter.





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Hmm.

I usually allow about 3/4" longer effective LOP for a SST.
Bob Jurewicz

Oh well…





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Thanks Bob, that is what I was asking essentially.

I am not a gun fitter and likely know less than others. However, this concept has always caused me to wonder.

My point is....if one had a proper fitting LOP with a double trigger gun is it common one would require a longer LOP if we changed it to a single trigger where the trigger had the same placement of the former rear trigger? I don't think I would go that route. I believe where I place my face on the gun in relation to the plane of the barrels would cause me more concern than the 3/4" manipulation of my trigger finger. My sense is placing my face further from the frame due to the placement of the trigger within the trigger guard space would seem to alter form more so from a geometry perspective.

This is not a statement, it is a question for those more knowledgeable.

All things being equal the wood on the single trigger gun should be longer by the amount of distance between the two triggers on the right hand gun.

Here’s what the authors of The Parker Story reported regarding LOP:

“Skeuse specified the pull length of the Reproductions to be 14 3/8 inches. Well, the Japanese made the guns exactly to that specification, but measured the pull from either the front trigger of two trigger guns or the single trigger of a gun so equipped. The single trigger on the Reproduction was located in the same position as the rear trigger on a two trigger gun. Thus, the single trigger Reproductions may have a pull length that is a little too long for some shooters.”

About 14-15 years ago, I had a 20ga. Repro with a single selective trigger that I had converted to double triggers. That conversion added 5/8” to the LOP.

I know I'm at least 120 years too late, but the only way to measure length of pull is from the middle of the butt to the rear of the trigger guard. The position of the triggers is of no consequence.

single trigger, long lop
 

I have a single trigger 20 ga.,the trigger seems to be in the rear position and
the lop,from trigger to center of butt plate is 15 1/4 ".
A twelve gauge that measures 14 1/4". That would lead me to believe lop dimensions could be anything ?

I have two Reproductions. The single trigger gun measures 14 1/4. The double trigger gun measures 14 3/4. The length of the wood on both guns are the same. I had assumed that was the case on all of them. I was at the gun show in Tulsa this year and measured a two trigger repro and it was 14 3/8. I guess my assumption was wrong.

This is a question, not a statement. What difference does a straight grip make in the perceived length of pull? Pistol grip, full or semi positions the trigger hand somewhat determining the position of the trigger finger and how far it must reach to contact the front or rear trigger. The straight gives the shooter the choice of position. I have one Parker straight grip which is very easy for me. Some of my guns with grips cause different trigger contact because of the grip.
Hope this is coherent enough to understand what i am asking. Does grip size and shape determine perceived trigger length also?

In this post I have read of two differing opinions of the way to measure the LOP. I always thought that the LOP was determined by measuring the distance from the center of the front trigger (on a two trigger shotgun) to the middle of the buttstock. Is there a definitive/standard way to measure LOP or does this vary from one fitter/stocker to another?

Although Repros were available optionally to be specified with a custom LOP, there has been an assumption floating around for decades that double trigger Repros that have a 14 3/4” LOP (there are many) were fitted with stocks intended to go on single trigger guns. Your guns support that assumption.

When the guns were initially ordered, the specs called for 14/8" LOP period. The Japanese took that to apply to either double or single triggers. The single trigger guns are all longer than the double trigger guns.

The common practice of measuring the LOP is to measure from the center of the butt, to the front trigger, on a double trigger gun. Where this leads to problems, is when a single trigger gun is measured from the center of the butt, to the (only) trigger. That may be the only way to report it, but if you shoot a DT gun with the same dimension as reported on a ST gun, you will find it to be roughly 3/4” too long to feel the same.
I know that the OVERALL length of a stock is almost exactly 1” longer than the lOP of a DT gun. Therefore, I keep that measurement in mind. Your hand ( and body angle) will then be the same. Then, shooting a ST gun will feel no different than pulling the back trigger on a DT gun.
At my age, remembering that overall dimension, is no longer important, as I have finally shed the last single trigger gun I will ever own.
Shoutout to Brian for his masterful conversion of my CHE 28 to double triggers.

Said so much better than I attempted (Bill as well)!

Edgar, I also interpret your comment about the same hand and body angle to mean...in order to have the same hand placement and body angle, the length of the stock would have to be the same regardless of whether it was a 1 or 2 trigger gun for said comparison.

For me, if a single trigger is in the rear position I need the LOP to be longer by the distance that would normally be between double triggers. I have proven this. I normally like a 14 3/4" to 14 7/8" pull, measured from the front trigger. But, I own a restocked LC Smith 32" barreled 16 ga. FWE with a HOT in the extreme rearward position. Whoever restocked the gun made the LOP 15 3/8", measured to where a front trigger would normally be. It's perfect and I shoot it very well on late season doves or clays (or crows).


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