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The FSA S can not swap the side it folds to.
The FSA Single will only fold to the left.
Yes, it is capable of folding to the right. Like you said you will have to push down instead of pulling up. That’s how I have it configured.
No, you need the adapter which Modern Weapon Systems sell for about $99 with shipping, less if they have a blem. This also only folds to the left and when it is folded to the left it leaves like a 1.5" gap between the brace and the gun. That's probably due to the picatinny adapter being offset to the left but I don't see any way of changing that. Better to get the dual version which folds both ways. That's probably what I'm going to do down the road and put this one on a different pistol.
If you get the rear picatinny plate for the mp5 or any other clone for that matter. I've been researching and it'll run you about $100 for that picatinny plate.
The FSA S is compatible with the Kuna.
Yes, it was made for the Strike Industries FSA, stock, or brace version.
The bar is aluminum.
This specific model is a stabilizer. I have notified our sales department to reach out about the product photo page listed here showing the incorrect Stock model on the first photo currently displayed on 11/25/24.