Great pic! I originally bought the A3 F stock, for my SP5, preferring the look of a collapsible stock. Eventually, I went with UMP side folder, for the comfortable cheek weld, on my SP5. The same for my SP5K, I have the B&T side folder, for the same reasons. I have to admit, I like the compactness, the B&T collapsible stock offers, and may have to rethink my options?