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Collet Bushings on Colt Series 70 9mm and 45 ACP

Discussion in 'Gunsmithing and Repairs' started by ZBill, Nov 11, 2012.

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  1. ZBill

    ZBill Member

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    Are the Collet Bushings on Colt Series 70 Government Models in 9mm and 45 ACP interchangeable? I need one for a 9mm and don't want to make a mistake.

    Thank you, Bill
     
  2. creeper1956

    creeper1956 Member

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    Yep... same basic dimensions. Your barrel should be around .580"+/- and your slide should be around .700"+/-. If you're several thousands under or over, you may want to consider a "oversize" bushing, which will require fitting to both barrel and slide. If you need an oversize bushing, take a look at the EGW "angle-bore" items, they can be had in several OD sizes, and are actually quite easy to fit.

    As a generic point of reference...
    Ed Brown specs: Drop-In: .581 ID, .699 OD. Oversize: .575 ID, .705 OD.
     
  3. rcmodel

    rcmodel Member in memoriam

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    Should be the same .580" I.D. I think.
    But to be completely sure you need to measure your barrel.
    It should be in the neighborhood of .579" O.D.

    But you would be way better off replacing it with a solid bushing.

    Collet bushing are prone to break fingers off and get jammed between the barrel & slide.

    And when they do, you may suffer slide or barrel damage beating the slide off.

    rc
     
  4. Drail

    Drail Member

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    Replacing a collet bushing with a solid one has no downside. Collet bushings were nothing more than effort by Colt to save a few bucks on manufacturing. If their tolerances weren't so sloppy there would be no need.
     
  5. ZBill

    ZBill Member

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    thanks RCModel and Creeper

    The barrel OD is .582. I fitted an EGW a few years ago and it is capable of excellent accuracy. I lost the original finger bushing and have been looking for a replacement. Now that you mentioned it I do recall the warning - I hate to lock it up.

    Thank you for the input. Bill
     
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