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Old 12-28-2018, 05:34 AM   #1
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Custom II Mainspring Question

Does anyone know the # of the factory mainspring in a full-size Custom II?

None of the instruction manuals I've looked at show that in the "specifications".

Thanks!
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Old 12-28-2018, 05:40 AM   #2
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The main spring for a Custom (5") Kimber is 21 lbs.
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Old 12-28-2018, 05:43 AM   #3
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I believe Kimber uses a 21# mainspring in their 5” guns. Was typing when Chuck answered...
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Old 12-28-2018, 06:05 AM   #4
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Thank you both for your quick replies!
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Old 12-28-2018, 06:13 AM   #5
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You might want to try a Wilson Combat Flat-wire recoil kit. They work great and last a lot longer.
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Old 12-28-2018, 05:11 PM   #6
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As far as recoil springs go I also really like the flat wire setup, especially in my 4" Kimbers. I actually run 19lbs. mainsprings with a flat bottom FPS in all my government frame sized Kimbers. They've all had trigger jobs ranging from 2.5 to 4lbs. depending on use and the lower weight mainspring helps facilitate that a little easier without compromising function especially when paired with the flat bottom FPS.
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