Yes, the Standard or MKI as some folks refer to them do have a different floor plate and only hold 9 rounds, but are simple to modify for a full 10, the II and III share the floorplate but run the spring helper on opposite sides of the mag.
The 22/45 mags have always been different.
If I had to unload all my Ruger .22 pistols these few would be the last to go. They are fun little guns.
MD,
You certainly have a great "keeper collection" of Mk's...bet they all shoot superbly!!
Unfortunately, I have an original RST Vintage 9-round mag (came with my used standard), with the solid pressed-in and pinned silver base plate! Going to leave it well enough alone, as I have "6" MkII mags to use with my Standard and MkI Target 6 7/8". Some members on RFC state it is a Collectable, so that Vintage mag will be relinquished as a safe queen investment (especially with the going E-Bay prices)!!
Ted
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