Mainspring weight for conversion

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Mainspring weight for conversion

Post by expendable on 4/4/2015, 6:24 pm

I just received a Nelson conversion and I'm having intermittent failures to eject or it will eject the spent round but not pick up the next in the magazine. I have tried it on both a Les baer hardball and a Kimber pro TLE frame with the same results. 

My first thought is to put in a lower power mainspring but I thought I would ask the others that use conversions their opinion. Would you go with a lighter mainspring (if so how light) or would you go with a lighter recoil spring ?

Kurt

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Re: Mainspring weight for conversion

Post by Jon Eulette on 4/4/2015, 6:40 pm

19# mainspring and 8# recoil spring
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Re: Mainspring weight for conversion

Post by xring2245 on 4/4/2015, 6:58 pm

Put a little oil on the top round of each magazine.

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Re: Mainspring weight for conversion

Post by teg2658 on 4/4/2015, 7:59 pm

I have shot Kart and Dworak units for 30 years. Jon Eulette tells the combination that has worked best for me.
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Re: Mainspring weight for conversion

Post by Rob Kovach on 4/4/2015, 9:31 pm

You can also order 7# and 6# recoil springs from Marvel.
I use 19# mainsprings from ISMI from Brownells
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Re: Mainspring weight for conversion

Post by kc.crawford.7 on 4/5/2015, 5:24 am

You should NEVER put oil on your ammo period.  What that does to chamber pressure is just scary.
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Re: Mainspring weight for conversion

Post by expendable on 4/5/2015, 7:59 am

G
Rob Kovach wrote:You can also order 7# and 6# recoil springs from Marvel.
I use 19# mainsprings from ISMI from Brownells

So the springs for a Marvel will work in the nelson, do all of the conversions use the same springs?
I can't find springs on Marvels sight, Midway only shows a 9 and a 10 # available,  I can get an 8 # from Nelson but no lighter , where do you buy them?

Kurt

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Re: Mainspring weight for conversion

Post by JayhawkNavy02 on 4/5/2015, 8:41 am

kc.crawford.7 wrote:You should NEVER put oil on your ammo period.  What that does to chamber pressure is just scary.

That's why I lubricate all my ammunition with bearing grease, doesn't evaporate and stays where I want it Wink

Absolutely kidding, terrible joke.

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Re: Mainspring weight for conversion

Post by C.Perkins on 4/5/2015, 8:42 am

I use recoil springs for a S&W model 41.
Get them from Wolff.

Clarence
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Re: Mainspring weight for conversion

Post by Rob Kovach on 4/5/2015, 9:46 am

I just call marvel, tell them how many of each weight to put in the little bag, and they take my order over the phone.
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Re: Mainspring weight for conversion

Post by expendable on 4/5/2015, 10:17 am

I was trying to find a replacement on Brownells so I could add it to the order for the mainspring.

Trying to avoid spending another $5 shipping a $4 spring. 

Kurt

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Re: Mainspring weight for conversion

Post by C.Perkins on 4/5/2015, 10:33 am

expendable wrote:I was trying to find a replacement on Brownells so I could add it to the order for the mainspring.

Trying to avoid spending another $5 shipping a $4 spring. 

Kurt

You can order both springs from Wolff.
Colt 1911 main/hammer spring and S&W model 41 recoil spring.

Clarence
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Re: Mainspring weight for conversion

Post by Rob Kovach on 4/5/2015, 10:53 am

Wolff ones aren't color coded.

I think Marvel shipped mine usps so shipping was minimal.
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Re: Mainspring weight for conversion

Post by expendable on 4/14/2015, 5:51 pm

Quick update:
I finally received the 19# mainspring and the 8# recoil spring, installed them and it is much better. 

I did notice something odd though and this may just be in my head, it seems as though the first round from a 5rd mag is weaker feeling than the rest, so if I'm going to have a round malfunction this is usually the one. 
I insert the mag with 5rds with the slide locked back and slingshot it to load, has anyone else notice something like this?

Kurt


Last edited by expendable on 4/14/2015, 6:22 pm; edited 1 time in total (Reason for editing : Change 18# to 19#)

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Re: Mainspring weight for conversion

Post by Jerry Keefer on 4/14/2015, 7:36 pm

kc.crawford.7 wrote:You should NEVER put oil on your ammo period.  What that does to chamber pressure is just scary.
Yeeeep..!!! Oil greatly decreases the cartridge case ability to grip the chamber walls.. Bolt thrust.. study
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Re: Mainspring weight for conversion

Post by expendable on 4/14/2015, 7:47 pm

Jerry Keefer wrote:
kc.crawford.7 wrote:You should NEVER put oil on your ammo period.  What that does to chamber pressure is just scary.
Yeeeep..!!! Oil greatly decreases the cartridge case ability to grip the chamber walls.. Bolt thrust.. study
I'm not putting any oil on any of the rounds.

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Re: Mainspring weight for conversion

Post by Jerry Keefer on 4/14/2015, 7:48 pm

expendable wrote:Quick update:
I finally received the 19# mainspring and the 8# recoil spring, installed them and it is much better. 

I did notice something odd though and this may just be in my head, it seems as though the first round from a 5rd mag is weaker feeling than the rest, so if I'm going to have a round malfunction this is usually the one. 
I insert the mag with 5rds with the slide locked back and slingshot it to load, has anyone else notice something like this?

Kurt
Every 22 exhibits that to some degree or another. In fact, most auto pistols.. You can see it on many 45s as the shooter progresses thru a magazine. The pressure from the magazine spring effects the slide velocity. As the rounds are fired, the last round produces more slide velocity than the first because of the drag exerted against the bottom of the slide by the loaded magazine. I have just finished a train wreck (factory induced) of an S&W 41. Took some pictures of what I have been talking about in regard to how sensitive 22s are to friction. As soon as I get all the photos sorted out and on photo bucket, I 'll post about the process. This gun is fairly new, but had a multitude of issues. Would not fire one complete magazine without a failure.
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Re: Mainspring weight for conversion

Post by Dipnet on 5/6/2015, 12:37 pm

I have heard many 'experienced' BE shooters recommend the temporary cure for failures to eject in 22s is to put a small drop of oil on the first 22 round in a magazine. I've only been shooting BE for a few years, but have heard the same advice repeatedly. 

I always wondered about the effects on accuracy but never thought about chamber pressure in 22s since most seem to be strongly-built firearms. I can see why Brylcream would be a bad idea.  affraid   dipnet
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