Colt Trooper .357 Trigger Reset Issue

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Kenton38

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Good morning all,

I’m not commonly on this site, but this community seemed the most likely place I would find an answer for my particular issue online.

I just recently purchased an old model Colt Trooper .357 Magnum, the kind with the Python frame and lock work. Looks like 1965 vintage by serial number on Colt’s website. After purchasing it, I immediately opened it up, disassembled it and cleaned what looked like 30 years of built up gunk.

Everything on the inside is clean, undamaged, and appears to be in its correct place. However, the trigger is now sticking back and not resetting. I noticed the issue today, and broke the gun down again and re-examined each individual piece, carefully reassembling. It ran flawlessly for about 10 cycles of the action, before the reset began slowing down and finally stopping.

I haven’t fired any rounds through it yet, just cycling action to determine the cause of this little issue. I found an old thread on this site, where someone was having a similar issue with a Python, but I don’t think his solution was ever posted.

My first instinct here is that it’s got to be an old, fatigued main spring. However, it’s strange that action will sometimes run smoothly and other times stick.

Any advice would be greatly appreciated, I’ll upload some photos here shortly.
 

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Attached is a photo of the appearance of the spring with trigger stuck to the rear. Also a photo of normal state after the trigger was manually reset.

I noticed that applying significant downward pressure to the reset lever will reset the trigger. It just doesn’t seem like the mainspring is that weak. Double and single action trigger pull feels completely normal, not too light. But then again, I don’t really know much about these Colts. All I can compare this to is my Smith model 10.

Its about time for me to get to bed now, but I’ll take the side plate off tomorrow and post more pictures if anyone is interested in helping me out.
 

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I was doing some more fiddling this morning before I left for work. First time touching the gun since about 2am this morning. When working the action with the grips removed, I got just about 10 clean cycles, before I felt the trigger start to “gum up,” and finally stick back with no reset at all.

The trigger will immediately reset completely when I apply just a hair of pressure on the right side of the reset lever and main spring, pushing towards the left side (cylinder latch side) of the frame.

As I said earlier, I’m a neophyte when it come to double action Colts. The main spring seems... loose? When cycling the action, it rides to one side or another in its notch in the grip frame. I’m not sure if that’s normal or not.

I’ve already ordered a replacement main spring, I’d like to have a spare even if this ends up being unrelated. I’m beginning to have doubts this is main spring related. The trigger feels too gummy, like the action is binding?
 
I think your going to have to wait for @dfariswheel to show up. He has shown the most knowledge of Colt revolvers of anyone I can think of on this forum. Should be around in the next few days.
 
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