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Elalto
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Odd Issue With A Model 4 Roller
Jun 9th, 2018 at 9:31pm
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Hi All,

Hope someone can give me a clue to why the trigger on my #4 is "stinging" my finger. I have three #4 .22LR rifles, two are the take down models and the other has the threaded in barrel.

The #4 with the threaded in barrel slaps my trigger finger every time I fire it. The sensation is beyond annoying and just past the painful threshold. I dissembled the  little rifle and can see no obvious defect or unusual  wear, matter of fact everything inside looks "new". I am wondering if the parts look new because it was shot very little because of the "slap"?

Any ideas as to why & better yet any idea as to how to correct it?

Thanks,
Marcos (elalto)
  
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marlinguy
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Ballards may be weaker,
but they sure are neater!

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Re: Odd Issue With A Model 4 Roller
Reply #1 - Jun 9th, 2018 at 10:43pm
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This is usually caused by the half cock notch being monkeyed with. The hammer drops and normally the half cock notch is slightly lower so the trigger wont catch on it. But if someone worked on the full cock notch to recut it, it might be lower so the half cock notch catches the trigger as the hammer is falling causing the trigger to strike your finger sharply.
The cure is to either build up the full cock notch, or work down the half cock notch so it's lower than the full cock. The rounded area between the half and full cock notches needs to end up higher, so as the trigger slips along the hammer it slips past the half cock notch without catching.
  

Vall
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John Taylor
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Re: Odd Issue With A Model 4 Roller
Reply #2 - Jun 12th, 2018 at 10:58pm
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My thoughts are the same as Vall's.
  

John Taylor   Machinist/gunsmith
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Elalto
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Re: Odd Issue With A Model 4 Roller
Reply #3 - Jun 13th, 2018 at 12:36am
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Thanks Guys,

I took a real good look under the microscope and could see that there was some indication of contact after the half cock slot. I dressed that area down some and the slap is almost gone. as soon as I have time I will dress it down some more and it should be gone.

Thanks again,
Marcos (elalto)
  
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marlinguy
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Re: Odd Issue With A Model 4 Roller
Reply #4 - Jun 13th, 2018 at 10:13am
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Glad it was an easy fix and not like some I've seen where someone went nuts removing metal!
  

Vall
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John Taylor
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Re: Odd Issue With A Model 4 Roller
Reply #5 - Jun 14th, 2018 at 9:09pm
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On the full size rollers I have built up the full cock with weld using high carbon steel for a hard surface. This allows the trigger pull to be lighter and smoother.
  

John Taylor   Machinist/gunsmith
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Elalto
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Re: Odd Issue With A Model 4 Roller
Reply #6 - Jun 15th, 2018 at 3:37pm
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I may end up trying that as the main spring and the trigger spring are very very heavy in my little #4.

I don't know if the roller on the hammer is supposed to spin, mine does not and may be contributing to the heavy pull to full cock?

Thanks again,
Marcos (elalto)
  
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marlinguy
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Re: Odd Issue With A Model 4 Roller
Reply #7 - Jun 15th, 2018 at 5:39pm
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It may also be that the mainspring was replaced and is just heavier than the original. The ball should roll, but if the pressure is too great it may be such that it wont allow the ball to roll easily.
  

Vall
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