The standard magazine that comes with most Ruger-57 pistols holds 20 rounds, but there are extensions available to increase the capacity.
Ruger-57 Magazines
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Frequently asked questions about Ruger-57 Magazines
How many rounds can a Ruger-57 hold?
Does The Mag Shack carry 5.7x28mm ammo?
Yes, we do! We carry a wide variety of 5.7x28mm ammo.