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4in Upper on a fullsize frame 1911??

Discussion in 'Handguns: Autoloaders' started by AF_INT1N0, Nov 29, 2006.

  1. AF_INT1N0

    AF_INT1N0 Well-Known Member

    Hey All,

    I was considering replacing the the 5'' slide on a springfield Armory 1911A1 loaded to have a 4'' slide.

    I also wanted to refinish it..

    What would I need to do to replace the upper on a 1911??
  2. 10-Ring

    10-Ring Well-Known Member

    I think you could do that but...as with the commander sized 1911s, the dust cover is a tad shorter than the gov't models, thereby precluding your from being able to interchangeably use your slides....i think :scrutiny:
  3. ugaarguy

    ugaarguy Moderator Staff Member

    Not sure on the specifics, but Old Fuff explained to me that the internal dimensions are signifigantly different when I asked a similar question. So the short answer is no; gov't slides on gov't frames, and commander slides on commander frames - unless you get the gov't frame cut for a commander slide.
  4. SnWnMe

    SnWnMe Well-Known Member

    The dust cover is shorter on the 4" IIRC.
  5. Magnumite

    Magnumite Well-Known Member

    I purchased a full size frame pistol with 4" upper way back. It was not a well done conversion. I corrected it, got it running and let the top end go. It is now a full size gun and runs like a top.

    Long story short, not a good idea unless you really know what to do.

    The front of the rails on a 4" frame gun are set back more.
    The barrel lower locking lugs are shaped differently and the outside barrel is relieved back farther, closer to the chamber.
    I believe the slide recoil spring tunnel back face is set farther forward on the slide along with the
    grooves in the slide.
    The barrel bushing is shorter.
    Shorter recoil spring guide and plug.
    Shorter, stronger recoil spring.

    If you want a 4" 1911, a Colt 1991 is a good price/dollar. I'd go that route first.

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