There are three variations of the SAF submachine guns. The first is their standard full-size gun designated simply the SAF (top). The second is an integrally-suppressed version called the S1 Silencer SAF (middle) and, last but not least, a very compact version called the MINI-SAF (bottom right). The bottom left gun is the standard model equipped with the side-folding stock. All three versions resemble copies of the same three versions of the MP5 series but with some very innovative features not found on the H&K guns.
All three versions use a modular construction and most parts will interchange between guns. The guns upper and lower receivers are made from stamped sheet steel. Furniture on the guns is a black synthetic with the overall finish being a black phosphate that almost appears to have a paint overcoat. The guns fire from a closed bolt which is unlocked and strictly a blowback instead of the roller-delayed blowback as is used in their H&K brothers.