Change 'upper' on Ruger 22/45

gotstolefrom

March 23, 2011 09:26

While re-assembling my MK II 22/45, I wondered about changing 'uppers' for different uses. Since I have two with different barrel lengths I tried it....putting the 5.5" slab-side on in place of the 6 7/8". I had no failures of any kind, so while my luck was good I swapped them back.

Do any of you know of potential problems...assuming you stay within the same models ( i.e. both MK II 22/45 's) , etc. ?

It's curiosity, I know....[:p]

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  11b6r

  March 23, 2011 09:48

  No problems. FWIW, with the Ruger auto pistols, unlike ARs, the "upper" IS the receiver, and is the serially numbered component.

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  Odawgp

  March 23, 2011 12:00

  The only difference between say a Ruger MkII and a Ruger MkII 22/45 is the grip frame the uppers/recievers are the same

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  Pearyw

  March 23, 2011 12:35

  I have a MKII and a MKII 22/45, and they will not interchange.

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  Mobuck

  March 23, 2011 15:54

  As reported on the Ruger forum, the 22/45 "upper" is reshaped(looks like it's been hit with a hammer on the underside) to tighten the interface between the hook on the grip assy and the rcvr tang. I have an extra receiver apparently from a 22/45 and it won't fit up with a MkIII standard grip frame. It can be made to fit by grinding.

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  jeffb1911

  March 24, 2011 09:47

  On most of mine they were interchangeable. Check out RimFire central for some more info. I've got a Tactical Solutions 10" fluted that i've had on a MKII grip frame as well as a MKIII 22/45 grip frame.

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