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Joined: May 2022
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old guy Offline OP
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Hello. I bought on old Iver Johnson Hercules some years ago at a gun show. Finally got around to trying it out the other day. Both barrels fired when I pulled the forward trigger. Pulling the trigger on a couple spent shells, showed me that the front trigger has a normal amount resistance to pulling the trigger. The rear trigger has considerably less resistance. It’s more like like the one in my varmint gun, than a shotgun. The gun is in good reasonable condition for its age. Closes tight, doesn’t look like it got dragged down a gravel road, kind of thing. I have done gun repairs before, after finding out complicated it is to do. Not having a lot of luck finding info on this one, tho.
My guess is recoil from the first shot is what set off the second shot, with the light trigger pull. Cleaning and maybe an adjustment is what I likely need.
The gun is stamped with patent dates MAR 16, 1915, APR 27, 1915, on the rib. The only real info I have been able to find is a person claiming the first couple years of production had side plates on the gun (1913-1914), which I appear to have. A bit in the dark about how to safely get the side plates off (remove the screw and tap the gun with a plastic mallet?) and what the trigger assembly itself looks like and how easy it is to work on? Any experiences of someone fixing this sort of problem will be appreciated.
Also, there was mention somewhere about whether it is chambered for 2 ½ or 2 ¾ inch. I shot 2 ¾ shells in the test firing. I don't have any tool for officially measuring that. I can measure with some internal machining tools I have. If the internal diameter in the chamber doesn’t change drastically for the length of a spent 2 ¾ case, can I assume the gun is chambered for 2 ¾ ?

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Sidelock
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sounds like sear/trigger engagement is worn...

re chamber length, assume nothing...

git gun to doublegun smith for fix and evaluation...some here from canada, maybe?

https://connecticutshotgun.co/professional-shotgun-chamber-length-gauge-with-integral-choke-gauge/

Last edited by ed good; 05/17/22 03:53 PM.

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Agree with Ed. Sounds like a sear issue. I'd leave that one to a gunsmith. As for chamber length, if the gun dates back to pre-WW1 years and especially if it's either a 16ga or a 20ga, then it's very likely that the chambers are shorter than 2 3/4". Better chance that it's 2 3/4" if it's a 12. But even then, it might be short chambered. Note that I'm speaking of ORIGINAL chamber length. Quite a few guns that left the factory with short chambers later got 2 3/4" chambers courtesy of a gunsmith.

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old guy Offline OP
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Oops, forgot to mention it is a 12 gauge.

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Sidelock
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Would sure like to see some good pictures of the "Sideplated" Iver Johnson.

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old guy Offline OP
Boxlock
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Boxlock

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[Linked Image from i.postimg.cc][Linked Image from i.postimg.cc]

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old guy Offline OP
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Had to do some fooling around. Couldn't find info on how to post pics. The third one wouldn't show up for some reason. It was a closer up shot of the plate in the second pic, with Iver Johnson, Arms & Cycle works, and an address for Mass.

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Wow, never seen one of those before. How low is the serial number?

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So is that a sideplated box lock? It looks like a Crescent at first glance but is not. Interesting to see with one of the side plate off. A lot of lower grade, Belgian box lock doubles, were available with a side plate to dress them up a bit.

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old guy Offline OP
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The number stamped on the frame underneath the barrels is 181. Haven't removed or disassembled anything. Just took a peek of the open action with my phone flashlight.

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