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G19 extra power mag spring wolf / ismi

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Just got a quick question hoping some one can help me out well here goes. For example : If the glock19 (factory oem) spring is 9coils and glock17 (factory oem) spring is 10coils, and (ismi/wolf extra power spring) for glock19 is 10coils and for glock17 11coils. Wich one would I run on glock19mag with +2mag extension? Since it will technically be the size of a standard glock 17 mag with the +2 extension? The 10coil (extra power spring) is usually used on glock19 mags I know that... My question is would it be possible to run 11coil (extra power spring) in a glock19 mag equipped with a +2 extension and still get the intended 2 extra rounds?Any thoughts??