For easy concealability the shortest SP9 A3S version is available, measuring just 316 mm with the stock folded (without a muzzle device). All internal parts have been designed for reliable function even with a short barrel. A FRN folding stock may be replaced by an end cap to further increase concealability. For such a small package they managed to retain a lot of accessory rail real estate at the 12 and 6 o'clock positions as well as M-LOK slots at the 3 and 9 o'clock. This allows the user to mount red dots, lights, lasers, grips and other accessories the user may want.