1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Collet Bushings on Colt Series 70 9mm and 45 ACP

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

  1. ZBill

    ZBill Well-Known Member

    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 Well-Known Member

    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

    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.

  4. Drail

    Drail Well-Known Member

    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 Well-Known Member

    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

Share This Page