They will work in a 21.
All of the newer magazines are designed to fit both the SF and the regular 21's.
Not all older 21 mags will fit in the SF's.
Look at the "notches" in the center and on the side.
All of the newer magazines are designed to fit both the SF and the regular 21's.
Not all older 21 mags will fit in the SF's.
Look at the "notches" in the center and on the side.
