Colt SM Ace misfires
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Thread: Colt SM Ace misfires

  1. #1
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    Question Colt SM Ace misfires

    In 40+ years with Colt 1911 types including the Ace and conversion units,I’ve never experienced as many
    misfires as my 1978 Ace. I’m getting lite strikes on many different types of ammo. I’ve replaced a new
    firing pin to no avail. Only other thing I can think of is the firing pin spring. Any thoughts? Pete
    Life Member NRA-1974
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  2. #2
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    Maybe the mainspring or headspace.
    Last edited by paulo57509; 06-05-2019 at 06:12 PM.
    824tsv likes this.

  3. #3
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    I agree with paulo57509. I would try a stiffer main spring. I'm not sure of the # of the stock SMA mainspring but I replaced the 23# mainspring with a 18# in my Combat Elite XSE lower and had light strikes using my Marvel Precision Unit#1 .22 Conversion Unit. I went back to the 23# mainspring and the problem went away.

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  5. #4
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    I’ve replaced the ms with a regular Govt model one. Forgot to mention that. I couldn’t tell the difference by looking at them
    but anyway. I tried four types of ammo and got misfires. If it was one type ammo wouldn’t be an issue but four types
    isnt acceptable.
    Life Member NRA-1974
    Psalm 23 “The Lord is my shepherd, I lack nothing—-“
    I had a commission USNR from 71-77 but do not consider myself a Vet
    My Dad and his four brothers USMC,WW2,Korea,Vietnam were Vets

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  6. #5
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    Options for miss-fires......

    Use an AR-15/M16 BORE brush to clean the chamber.
    Push it into the chamber then rotate a few full turns and pull out. Inspect the chamber for fouling, damage, corrosion.
    Chamber problems can cause the cartridge to not seat fully and that "pads" the firing pin blow.

    Replace the firing pin spring even if it looks good. Make sure the small end goes on the pin first.

    Replace the mainspring with a new, stronger spring.
    Wolff Gun Springs sell stronger springs.

    Observe the gun to insure the slide is fully closing on the round.

    Inspect the chamber mouth for burrs or damage that might be causing the round to not seat fully.

    Inspect the slide's breech face for any damage including the firing pin hole.

    Inspect the firing pin tunnel for debris, corrosion, or damage that is interfering with the firing pin or spring.

    Inspect the rear end of the firing pin and firing pin stop to insure adequate firing pin head protrusion out the firing pin stop hole.
    arjay and po18guy like this.

  7. #6
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    Quote Originally Posted by dfariswheel View Post
    Options for miss-fires......


    Replace the mainspring with a new, stronger spring.
    Wolff Gun Springs sell stronger
    Did all the suggestions and put a 26# mainspring—-what a bear to get in! Now misfires occur on FIRST round only
    after slingshotting the slide,not every time but it’s the first shot. Gun is 40 years old,possibly RECOIL spring
    weakened? Going to try a 16# pound and hope it’s not too strong to cycle the slide. Thanks
    Life Member NRA-1974
    Psalm 23 “The Lord is my shepherd, I lack nothing—-“
    I had a commission USNR from 71-77 but do not consider myself a Vet
    My Dad and his four brothers USMC,WW2,Korea,Vietnam were Vets

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  8. #7
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    Try loading from a locked back slide using the slide stop.

    Some guns, like the Kahr Arms require loading by using the slide stop.
    Some will work by sling shotting but some autos work better using the slide stop to load.


 

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