MPL delta
Whereas the MP5 is a bit of a race car that needs special tools for in-depth maintenance, the MP is made simply of metal stampings. For instance, the barrel on the Walther can be swapped out by a user in the field with no tools. Plus, its 550-round cyclic rate, slower than that of the HK, was closer to that used by the M3 Grease Gun and earlier MP38/40, allowing a more familiar learning curve to those already used to those platforms. Little wonder it was adopted by the early U.S. Tier 1 counter-terror operators when Delta Force was first stood up. (Photos: U.S. Army, National Archives, Springfield Armory National Historic Site)