Maximize capacity in the STI, AND (curiously) the Walther PPQ! Using this spring/follower kit together with one of our Walther PPQ +6 extensions can increase your firepower from +6 to as much as +8! That's 22, even 23+1! We learned that trick from Walther Pro Hwansik Kim.
NOTE: Grams followers offer a trade-off, you get +1 round of capacity, but your gun will not lock open when empty.
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Grams spring/follower used in Walther magazine
Works as advertised! 23+1 in Walther PPQ magazine with +6 basepad. Thanks Hwansik and Robin!