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  #1  
Old 03-24-2020, 05:00 PM
makeminea1911 makeminea1911 is offline
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Main Spring Weight 10mm SR1911

I recently started getting an occasional light strike on a Ruger SR1911 10mm which I bought used a few months back. I made sure the firing pin channel was free of crud and oil. I'm now thinking I may need to replace the main spring/hammer spring. On contacting Ruger I was told it is a 29 lb spring. Does this sound correct to those who are experts? That weight seems rather heavy to me. In fact I don't even find one that heavy on Brownell's site. Appreciate any input. Thanks.
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  #2  
Old 03-24-2020, 05:27 PM
Steve in Allentown Steve in Allentown is offline
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Check out the Wolff Gunsprings site. They list Government size mainsprings (hammer springs) from 15lbs to 34lbs. It would be unusual for a mainspring to go bad especially one that is essentially brand new.

I would be concerned that there's something else causing the light strikes.

Are the light strikes happening on your reloads?

You can try the pencil test. It might tell you something. Drop a pencil (eraser end down) into the barrel, point the pistol straight up, cock the hammer, and pull the trigger. The pencil should launch out of the barrel with authority. If it doesn't, do a complete detail strip of mainspring housing and look for anything that might be causing the problem.

Last edited by Steve in Allentown; 03-24-2020 at 05:37 PM.
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  #3  
Old 03-24-2020, 06:30 PM
makeminea1911 makeminea1911 is offline
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Thanks Steve. I'm not sure how many rounds it was fired before I bought it used but I was thinking someone may have changed the main spring to lighten the trigger. It just seems a bit overkill to put in a 29# spring if it's not needed.

Thanks for Wolf info. I'll check out the main springs. I just ordered a couple recoil springs from them for a 9mm and 45 Commander.
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  #4  
Old 03-24-2020, 06:36 PM
BBBBill BBBBill is offline
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Does the Ruger use Series 80 lock work and does your trigger have an overtravel screw?
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  #5  
Old 03-24-2020, 07:05 PM
makeminea1911 makeminea1911 is offline
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Yes it is a series 80 and does have over travel screw. It also has a titanium firing pin if that matters.
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  #6  
Old 03-24-2020, 07:57 PM
makeminea1911 makeminea1911 is offline
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A series 70. I was thinking of another 1911.
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  #7  
Old 03-24-2020, 08:30 PM
Longone Longone is offline
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How about the pencil test? Maybe that would give an indication.
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  #8  
Old 03-24-2020, 09:31 PM
Steve in Allentown Steve in Allentown is offline
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Quote:
Originally Posted by makeminea1911 View Post
It just seems a bit overkill to put in a 29# spring if it's not needed.
I have some experience with 10mm in a 1911 and you'll never get it to eject brass into a neat little pile 5 feet away using factory loads no matter how strong a mainspring you use. Just the nature of the beast.

However, I can wholeheartedly recommend fitting a flat bottom firing pin stop to help tame the rearward slide velocity, a heavier than standard mainspring (~25lbs), and an 18-20lb recoil spring. Other folks who have more experience than I with the 10mm may recommend other combinations of spring weights. At some point it comes down to you experimenting with different springs to see what you like the best.
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  #9  
Old 03-24-2020, 09:36 PM
makeminea1911 makeminea1911 is offline
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Forgot to cover that...tested that right after the first lite strike. Not as strong as some of my others but stronger than some that are not giving me lite strikes. I'd say it send the pencil 12 ft up.
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  #10  
Old 03-24-2020, 09:36 PM
jjfitch jjfitch is offline
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Listen to Steve's post and this guy....

"Ned Christiansen at Michiguns published some test results a number of years back that indicate slide velocity is close to the same as 45 ACP when using a 25# mainspring with a flat bottom firing pin stop and a 18.5 lb recoil spring." A little research can verify this.

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Last edited by jjfitch; 03-24-2020 at 09:39 PM.
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  #11  
Old 03-25-2020, 08:10 AM
jglenn jglenn is offline
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Check to see if the hammer is dragging on the sear..with an empty pistol hold the hammer and pull and hold the trigger back. slowly ease the hammer down and if you feel any catch or drag the problem most likely is your trigger overtravel screw needs to be loosened a 1/2 turn or more..
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  #12  
Old 03-25-2020, 10:12 AM
makeminea1911 makeminea1911 is offline
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Thanks jglenn - that may have been the issue. There was a small amount of hammer drag. Now I'll have to get out and test it.

Thanks to all who responded.
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  #13  
Old 03-25-2020, 01:32 PM
NoExpert NoExpert is offline
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"It also has a titanium firing pin if that matters."

I would change to a steel firing pin. Plenty of threads here on the subject.

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  #14  
Old 03-25-2020, 02:21 PM
sevenL4 sevenL4 is offline
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The combination of titanium firing pin and extra strength firing pin spring has been the topic of several posts mentioning light strikes on primers. The problem seems to go away when a regular spring and steel FP are used. I don't have a 10mm but all my .45s run fine with flat bottom stops and 19lb mainsprings.
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  #15  
Old 03-25-2020, 02:22 PM
makeminea1911 makeminea1911 is offline
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I have a brand new Ed Brown or Wilson steel firing pin in my parts drawer. I may just install it. Excuse my ignorance but will there be any issues with firing pin length or firing spring strength? I have a couple firing pin springs in the drawer too.
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  #16  
Old 03-25-2020, 02:32 PM
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Quote:
Originally Posted by sevenL4 View Post
The combination of titanium firing pin and extra strength firing pin spring has been the topic of several posts mentioning light strikes on primers. The problem seems to go away when a regular spring and steel FP are used. I don't have a 10mm but all my .45s run fine with flat bottom stops and 19lb mainsprings.
Springfield uses a very heavy mainspring with titanium pin. I remember reading something about the "impulse" of a Ti pin being different from steel, and how primers are designed, formulated, or whatever term is appropriate, for steel firing pins, and Ti pins need a heavier spring to ensure proper ignition.
At the same time, you want that heavy spring in a 10mm to help reduce slide velocity.
Even with a 25# main, and small-radius firing pin stop, my Delta Elite flings cases 15 feet or more, even with mid-range loads.
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Old 03-25-2020, 05:22 PM
Steve in Allentown Steve in Allentown is offline
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Quote:
Originally Posted by makeminea1911 View Post
Excuse my ignorance but will there be any issues with firing pin length or firing spring strength?
You need to be sure the new firing pin doesn't get jammed in the firing pin breechface hole. If the new firing pin diameter is too big, you've got a problem. Test fit by trying to insert the business end of the firing pin (without its spring) into the hole from the front.

Length of the firing pin and the strength of the firing pin spring should not be an issue.
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Old 03-25-2020, 08:04 PM
makeminea1911 makeminea1911 is offline
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Thank you Steve.
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Old 03-25-2020, 08:17 PM
jglenn jglenn is offline
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I'm probably with most folks here. ditch the Ti FP..
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  #20  
Old 03-26-2020, 12:00 PM
dakota1911 dakota1911 is offline
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Another part of the picture are the primers that are used in store bought ammo or the ammo you reload. They are not all created equal. I have been O.K. with my SR1911-10 I bought back in the fall of 2017. Ruger uses the Titanium firing pin and more powerful firing pin spring for drop protection. That is why they do not use a mechanical firing pin safety.

I have noticed that in the new Colts without a mechanical firing pin safety they seem to be using a Titanium firing pin also although with a standard firing pin spring.

If it was me I would remove the firing pin, spring, and extractor and clean out that hole. There may be some gunk in there. Also check the size of the hole the firing pin pokes its nose through. I know others have replaced the Ti firing pin with a steel one and then one may want to go with a standard firing pin spring. Not sure which brands work best.
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Old 03-26-2020, 06:50 PM
Old Fart Old Fart is offline
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Quote:
Originally Posted by makeminea1911 View Post
I recently started getting an occasional light strike on a Ruger SR1911 10mm which I bought used a few months back. I made sure the firing pin channel was free of crud and oil. I'm now thinking I may need to replace the main spring/hammer spring. On contacting Ruger I was told it is a 29 lb spring. Does this sound correct to those who are experts? That weight seems rather heavy to me. In fact I don't even find one that heavy on Brownell's site. Appreciate any input. Thanks.
How many is "occasional"? 1 in 10, 1 in 100, 5 in 20? What ammunition are you using, and if reloads, what primer? I think I'd exhaust ammunition/primer as a possibility before rebuilding what is a pretty well-designed pistol, and a fairly new one at that.

Not saying it isn't mechanical; I have a pretty new SR1911 10mm and will be following this to see what you find. So far mine has been flawless, and yeah, it throws brass into the next zip code. I should include that I've used two different factory ammo brands, Federal and Winchester, and my own reloads with Winchester, Federal and CCI primers.

Last edited by Old Fart; 03-26-2020 at 06:54 PM.
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  #22  
Old 03-30-2020, 02:41 PM
makeminea1911 makeminea1911 is offline
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Just to give feedback to anyone who might follow this thread at a later date; I took the Ruger out and fired around 100 rounds without a failure. I'm not certain the problem is solved but for now I'm leaning in that direction. The things I did were to back out the over travel screw a bit, changed out the firing pin for an all steel one and changed the firing pin spring to a new heavy duty one I had from Wolf.

Having bought this used, I have no idea how many rounds were fired by the original owner prior to me purchasing it nor what kind of tinkering he may have done. My original concern, which still remains, has the mainspring/hammer spring (not the recoil spring) been changed out by the original owner to lighten the trigger. In my OP I ask if the 29# spring recommend sounded right. Steve from Allentown did tell me where I could find springs up to 34#.

I do sincerely appreciate all the input.
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