light strikes with new conversion lower

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light strikes with new conversion lower

Post by knightimac on 3/29/2018, 6:31 pm

Hi all.

I've been experiencing light strikes/misfires with a new lower for my 22 conversion.  12 misfire/light strikes in 200 rounds.

I popped the conversion on my wadgun lower.  It ran nearly flawlessly with only 1 misfire in 300 rounds using same ammo and mags.

I don't think it's the ammo CCI standard plastic box.

What are the most likely causes for this issue?

Thanks in advance for your help.

Paul
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Re: light strikes with new conversion lower

Post by messenger on 3/29/2018, 6:43 pm

I had a similar problem years ago with a Marvel. Check to see if you have a chip in your firing pin and or a broken firing pin spring.

Bill
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Re: light strikes with new conversion lower

Post by Tim:H11 on 3/29/2018, 7:22 pm

Who built the lower? What hammer spring weight is in the lower? Check firing pin, firing pin spring, and check to see if the chamber is too fouled up.
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Re: light strikes with new conversion lower

Post by Skid on 3/29/2018, 7:25 pm

Maybe your new lower has to light of a mainspring. I wouldn't go lighter than a #18. Just a thought.

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Re: light strikes with new conversion lower

Post by knightimac on 3/29/2018, 7:35 pm

A friend who is a gunsmith built lower.

I'll have to check on the hammer spring weight.  The chamber is clean.  I thought I ruled out problems with the conversion since it runs nearly 100% on my wadgun lower. 

Firing pin/spring maybe since my wadgun has heavier trigger weight of about 3.5#.

Dedicated lower is at about 2.5#.  Maybe mainspring is too light.
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Re: light strikes with new conversion lower

Post by Tim:H11 on 3/29/2018, 8:10 pm

knightimac wrote:A friend who is a gunsmith built lower.

I'll have to check on the hammer spring weight.  The chamber is clean.  I thought I ruled out problems with the conversion since it runs nearly 100% on my wadgun lower. 

Firing pin/spring maybe since my wadgun has heavier trigger weight of about 3.5#.

Dedicated lower is at about 2.5#.  Maybe mainspring is too light.

Sounds like it to me possibly. I called Nelson once and he said 17# can cause failure to fire (light strikes) that 18# was about as light as you want to go. 19# would be better.
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Re: light strikes with new conversion lower

Post by Vociferous on 3/30/2018, 12:26 pm

Agreed about the mainspring.  Replaced that and almost all my light strikes went away.


Last edited by Vociferous on 3/30/2018, 12:28 pm; edited 1 time in total (Reason for editing : grammer)
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Re: light strikes with new conversion lower

Post by knightimac on 3/30/2018, 3:43 pm

Thanks to all who responded.  Going to replace mainspring next week for a brand new #20 one.
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Re: light strikes with new conversion lower

Post by Chris Miceli on 3/30/2018, 3:54 pm

knightimac wrote:Thanks to all who responded.  Going to replace mainspring next week for a brand new #20 one.
May have to go to the 8lb recoil spring
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Re: light strikes with new conversion lower

Post by dronning on 3/30/2018, 4:27 pm

Chris Miceli wrote:
knightimac wrote:Thanks to all who responded.  Going to replace mainspring next week for a brand new #20 one.
May have to go to the 8lb recoil spring
+1
Heavier mainspring may require the lighter recoil spring for proper cycling.
- Dave
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Re: light strikes with new conversion lower

Post by JKR on 3/30/2018, 5:39 pm

8 and 20 have worked the best for me. Never could get a 9# spring to work perfectly with the ammo I use. I've had to go as light as 18# on the main spring with a Marvel that was giving  problems. Tried 17 but also had misfires.

Jim

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Re: light strikes with new conversion lower

Post by djw1cav on 4/1/2018, 7:17 am

I struggled with occasional light hit no fires for a year and a half with my Nelson conversion (toward the end of that time it was 1 in 50) .  During that I tried everything heavier springs, cleaned the firing pin port, and talked to the factory several times.  Finally I started looking the firing pin hits on my cases versus firing pin hits on cases from other bullseye guns.  I noticed that area of the dents that my firing pin left was between .5 times and 3 times as large as the dents from other bullseye guns.  I researched that on the internet and found someone with a Marvel conversion had reduced the area on his firing pin and solved his light hit problem.  So I reduced my firing pin area from .090" X .035" to .060" X .030", (which was still larger than most of the bullseye pistols I was comparing to).    Since I reduced the area on my firing pin, I have put about 3500 rounds through the gun and have not had any rounds that failed to fire due to a light hit. 
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Re: light strikes with new conversion lower

Post by knightimac on 4/12/2018, 7:56 pm

Hi All.

Reporting back-changeover to #20 mainspring from #17 spring has really helped.  In last 200 rounds only 1 misfire.

BTW, I also went to 8# recoil spring instead of #9 that I had in the conversion.  Won't lock open now but reliable!

I'm toying with idea of cutting off a coil or two off a spare #9 pounder to make an 8 1/2ish one.

I also noticed the firing pin strikes do look much bigger on my Nelson compared to my two Rugers.  The Rugers only which had one or two misfires a YEAR.

I hoping this has put me on the right path.  I just shot a 97 rapid fire last club practice on Tuesday (good for me)

Fingers crossed.

Paul
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Re: light strikes with new conversion lower

Post by Skid on 4/12/2018, 8:14 pm

Your slide not locking back after the last round could be your slide release not getting picked up by the magazine that's what happened to mine after 10,000 + rounds. I called Larry and now I have a new one and the slide back every time. Congratulations on your 97 rapid fire.

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