1913 left-folding stabilizer with steel hinge and polymer end pieces. Springfield sells the Kuna KN9069B-FSA variant with a Strike Industries FSA brace.

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Strike Industries Stabilizer Edition FSA Single Folder Black One Size
Strike Industries' FSA Single Folder (Stabilizer Edition) is the factory-partner brace Springfield pairs with the Kuna KN9069B-FSA variant. It mounts to any 1913 Picatinny rear interface, which is what the Kuna's rear rail end plate presents, so no separate adapter is required. The hinge is steel; the end pieces are Strike Industries' high-strength polymer. Assembled weight is 11 oz.
The FSA folds left and ships with a Torx T27 tool and a warning card. At roughly $160 street it is the cheapest full-quality brace path for the Kuna and the one with the most user-reported data, since every KN9069B-FSA ships with one.
Add the Strike Industries FSA Single Folder (Stabilizer Edition) to your build and see how it enhances your platform.