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 Post subject: Bottom barrel: soft strike 50% of the time
PostPosted: Fri Apr 02, 2021 7:22 pm 
Field Grade

Joined: Mon Oct 19, 2015 8:31 am
Posts: 92
Brand new Kolar pins and springs. Spring cut by a few coils. Pin passageways cleaned.

50% of the time bottom barrel fails to fire with a light strike to the primer. Closing the gun again and keeping same wheel in bottom barrel successfully fires.

Any thoughts or similar experiences?



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 Post subject: Re: Bottom barrel: soft strike 50% of the time
PostPosted: Fri Apr 02, 2021 8:20 pm 
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Location: Rochester, NY
Why would you cut coils off of your mainsprings?

Right there you pretty much answered your own question is to what's causing the issue.....

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S3 Smingler Shotgun Sports
Ian Smingler
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Manufacturer of Custom Brass Barrel Weights for over/under, top single, and unsingle shotguns.


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 Post subject: Re: Bottom barrel: soft strike 50% of the time
PostPosted: Fri Apr 02, 2021 8:34 pm 
Presentation Grade

Joined: Wed Jun 05, 2019 10:17 am
Posts: 873
Send your trigger group back to Kolar and have them install new hammer springs.

My gun was annualed in December 2019 and has been shot about 10,000 rounds since. Recently, I have been getting an occassional fail-to-fire in the bottom barrel. I called Kolar and talked to one of the technicians. He told me that in October of last year, they made a change to the tip profile of the firing pins as well as increased the installed load of the hammer springs by about 20%. The real answer to your problem, most likely, is the increased driving force of the hammer springs.


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 Post subject: Re: Bottom barrel: soft strike 50% of the time
PostPosted: Sat Apr 03, 2021 2:02 pm 
Tournament Grade

Joined: Wed Feb 17, 2021 2:57 pm
Posts: 172
Skeet_Man wrote:
Why would you cut coils off of your mainsprings?

Right there you pretty much answered your own question is to what's causing the issue.....


Agree 100%.


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 Post subject: Re: Bottom barrel: soft strike 50% of the time
PostPosted: Sat Apr 03, 2021 9:03 pm 
Field Grade

Joined: Mon Oct 19, 2015 8:31 am
Posts: 92
Skeet_Man wrote:
Why would you cut coils off of your mainsprings?

Right there you pretty much answered your own question is to what's causing the issue.....


Firing pin springs, not main springs. Firing pin spring clipping is something Kolar frequently does to reduce inertia against the pin moving forward toward the shell.

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 Post subject: Re: Bottom barrel: soft strike 50% of the time
PostPosted: Sat Apr 03, 2021 9:13 pm 
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Posts: 9256
Location: Rochester, NY
Did you cut the springs or did Kolar?

When's the last time the mainsprings were replaced and/or you had a complete annual done on the gun?

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S3 Smingler Shotgun Sports
Ian Smingler
[email protected]
http://www.sminglershotgunsports.com

Manufacturer of Custom Brass Barrel Weights for over/under, top single, and unsingle shotguns.


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 Post subject: Re: Bottom barrel: soft strike 50% of the time
PostPosted: Sun Apr 04, 2021 9:20 am 
Field Grade

Joined: Mon Oct 19, 2015 8:31 am
Posts: 92
Skeet_Man wrote:
Did you cut the springs or did Kolar?

When's the last time the mainsprings were replaced and/or you had a complete annual done on the gun?


I cut the Kolar supplied springs copying Kolar cut springs exactly. Full annual 2.5 years ago with reasonable rounds through the gun since.

Time to go back.



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