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Old 06-15-2010, 12:45   #4
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Join Date: Dec 1998
Location: Oldtown Idaho USA
Posts: 3,936
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Standard G20/21 mags use the same spring (#448) in Gen 1/2/3 magazines.
Current SF mags (and a few gen 3) use a special spring called the wide base (#1300) designed for use with 1304 (#1,2,3 followers).
I discussed this issue with the KRISS crew. They informed me the only requirement was a new 10mm follower.
If they are aware of the difference, this means I do not have to make one. I guess I am content to wait for them to develop it for me.
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