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SR1911-10 barrel lower lug is cracked

This is a discussion on SR1911-10 barrel lower lug is cracked within the Ruger Pistols forums, part of the Pistol & Revolver Forum category; Was cleaning my SR1911-10 after a range session and discovered that the barrel lower lug is cracked. I can see daylight clean through it. Sent ...


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Old February 6th, 2020, 05:02 PM   #1
 
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SR1911-10 barrel lower lug is cracked

Was cleaning my SR1911-10 after a range session and discovered that the barrel lower lug is cracked. I can see daylight clean through it. Sent a note to Ruger, and I await their response. I'm sure glad it didn't come apart as I was shooting it. Have you ever heard of this happening?
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Old February 6th, 2020, 05:36 PM   #2
 
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Hi Sparky, Here is a link to RugerForum.com where this happened to another 10mm owner. RugerForum.com ? View topic - SR1911 10mm Failure...And The Final Update
Best,
Rob
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Old February 6th, 2020, 05:45 PM   #3
 
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Yikes,

I would think the inside corner of the lug (where the crack is) would have been designed with a radius.
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Old February 6th, 2020, 05:53 PM   #4
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I'm sure Ruger will take care of it but I'd still look for an aftermarket 10mm 1911 barrel from a well known source.
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Old February 6th, 2020, 06:08 PM   #5
 
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Ouch, based on the other thread that was shared something could have been off a few microns. Hopefully it was the barrel that is off so your new one when the replace it will fare better.
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Old February 7th, 2020, 04:01 AM   #6
 
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Quote:
Originally Posted by robmkivseries70 View Post
Hi Sparky, Here is a link to RugerForum.com where this happened to another 10mm owner. RugerForum.com ? View topic - SR1911 10mm Failure...And The Final Update
Best,
Rob
I read this post last night, Rob. A guy called 1911Tuner seems to really know his stuff. Thanks.
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Old February 7th, 2020, 08:55 AM   #7
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In the mid-90's, I bought a new 10mm Colt Delta Elite Gold Cup that did the same thing after just 50 rounds. After some discussions with Colt, they finally sent me a 40 S&W barrel that worked much better and was more accurate. Seems Colt was getting a lot of flack from customers with cracked frames and barrel lugs in their Delta Elites. The conclusion was … 10mm Auto was just too powerful for a 1911 platform in their origional configuration. I don't know what Colt did but they continued to market the Delta Elite.

So …. it's not a new issue but it certainly is something Ruger needs to take care of.
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Old February 7th, 2020, 09:33 AM   #8
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Cracked lugs like that look kinda scary. That steel looks like it ripped like old wrought iron.
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Old February 7th, 2020, 09:59 AM   #9
 
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I don't know I would want any 1911 in 10mm. As Iowegan stated that has been an issue with any 10mm 1911. It's an originally designed 18000 psi gun shooting a 35000 psi round.

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Old February 8th, 2020, 04:03 AM   #10
 
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Quote:
Originally Posted by Sr40ken View Post
I don't know I would want any 1911 in 10mm. As Iowegan stated that has been an issue with any 10mm 1911. It's an originally designed 18000 psi gun shooting a 35000 psi round.
I've read that this type of failure is not limited to 10mm. It happens to .45ACP bbls as well. It also seems to be unrelated to the ammo loads. It is more likely attributable to poor design, either the link or the lug is not sized properly, or the lack of a radiused lug, perhaps. 1911Tuner explains it in detail.
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Old February 8th, 2020, 07:18 AM   #11
 
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Link fit is key, too tight and things are gonna break. But to infer that 10mm is no harder on the platform than 45 AP would not be correct.
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Old February 8th, 2020, 07:34 AM   #12
 
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Quote:
Originally Posted by Sr40ken View Post
I don't know I would want any 1911 in 10mm. As Iowegan stated that has been an issue with any 10mm 1911. It's an originally designed 18000 psi gun shooting a 35000 psi round.
Yet the .38 Super runs at a higher pressure and has no problems. The 9mm runs at the same pressure and has no problem.
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Old February 8th, 2020, 07:55 AM   #13
 
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124 gr pill vs 180 gr pill etc, oy vey. Mass, inertia etc so lets say a guy that runs his 38 super at 32000 psi loads will not last longer than the guy that runs 35000 psi. Metal doesn't work that way. So if I run top of the chart 357 in my SP101 it's will last just as long as one that runs 38 special it's entire life?

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Old February 8th, 2020, 09:25 AM   #14
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There's more to the formula than chamber pressure, although it is one of the key elements. The attribute that most affects this condition is "slide thrust", which is the momentum developed by the cartridge. In the case of my Delta Elite, it had "piggy back" recoil springs …. one was a conventional 18 lb recoil spring and the other was a shorter spring inside the recoil spring. It was so stiff, it almost took a gorilla to lock the slide back.

A normal 45 ACP 1911 has a 16 lb recoil spring (21k psi) and a 45 ACP +P has an 18 lb recoil spring (23 k psi) whereas as a 10mm Auto has 23 lb recoil spring with the same basic weight slide and barrel assembly. This means the 10mm Auto develops way more slide thrust than a 45 ACP, 40 S&W, 38 Super, or 9mm. A 38 Super has 36,500 psi chamber pressure with a 16 lb recoil spring. A standard 9mm develops 35,000 psi, and a 9mm +P develops 38,500 psi, both use a 14 lb recoil spring. A 40 S&W develops 35k psi and uses a 16 lb recoil spring. As you can see the highest chamber pressure (9mm +P) uses the lowest rated recoil spring, however chamber pressure is still an important factor.

A 9mm develops about 20 lb-f/s momentum, a 38 Super develops about 24 lb-f/s momentum, a 40 S&W develops about 26 lb-f/s momentum, a 45 ACP develops about 27 lb-f/s momentum, and a 10mm Auto develops about 32 lb-f/s momentum. As you can see, momentum is a much closer measurement than chamber pressure when determining slide thrust and recoil spring tension.

The formula for determining slide thrust (recoil spring weight) is the cartridge's momentum divided by the weight of the slide and barrel assembly with adjustments for powder burn time and chamber pressure. If a lighter slide is used, a heavier recoil spring can be used to compensate and likewise for the reverse.
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Old February 8th, 2020, 09:27 AM   #15
 
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Great information!
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