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peabo
What are the differences between the pre 70 series 1911s and the 70 series MK IV Government model?

We know they made major changes between the 70 series and the 80 series.

I remember that they changed the serial number sequence at that time, but was that the only change?


Thanks---Peabo
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Comments

5 comments

Date Votes
  • rufe-snow
    As best as I can remember it was the barrel bushing with the spring fingers, as opposed the solid barrel bushing of pre series 70 1911A1's.
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  • perry shooter
    Rufe Snow is correct all parts except barrel and bushing will interchange . I have no proof of this but also ave heard they changed the alloy of steel and tolerance of slide to frame fit Both of these IMHO on rockwell hardness testing could be from heat treatment and tooling on each piece not something that was CHANGED over the product line. On the Gold Cups the Slide did change . The pre 1970 had internal cuts machined to make the slide lighter sort of like the Ace and service ace units . This allowed the 185 grain semi wadcutter Target load to function . However this caused damage with 230 grain BALL AMMO .The series 70 has full weight slide in fact slightly heavier then the Government model because of the flat top of the Gold Cup. For years there was a debate on if gold cup had weaker/lighter recoil spring then standard and if you could shoot standard loads in the gun. "PRAISE THE HARD-BALL GUN"
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  • peabo
    Now that you mention it, I remember the split finger bushing.(And I have a 70 series right here!)

    If I remember, they only used that split bushing for a short time, not throughout the 70 series production.

    Was there a problem with that bushing - like losing its tension on the barrel? Why did they go back to the solid bushing?

    Just trying to bring back some memories long forgotten.


    Thanks---Peabo
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  • perry shooter
    I never had it happen some some people said to have one finger break.
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  • Hawk Carse
    quote:Originally posted by peaboIf I remember, they only used that split bushing for a short time, not throughout the 70 series production.

    Was there a problem with that bushing - like losing its tension on the barrel? Why did they go back to the solid bushing?

    Actually, the collet bushing lasted a while up into the Series 80 (firing pin block) guns. They used a solid bushing on the 10mms, then went back to it for the .45s, sometime around 1985.
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