Today I have a couple blueprints for your browsing pleasure. This PDF document includes plans for the Sten MKII, MP40, Yugo 56, and the BMG 50
The MP 40 (Maschinenpistole 40) was a submachine gun chambered for the 9×19mm Parabellum cartridge. It was developed in Nazi Germany and used extensively by the Axis powers during the Second World War.
Designed in 1938 by Heinrich Vollmer with inspiration from its predecessor the MP 38, it was heavily used by infantrymen (particularly platoon and squad leaders), and by paratroopers, on the Eastern and Western Fronts. Its advanced and modern features made it a favorite among soldiers and popular in countries from various parts of the world after the war. From 1940 to 1945, an estimated 1.1 million were produced by Erma Werke.
Also in the event you are interested, all of these gun documents I am posting can be found on the disk I have listed to your left. Additionally to the hundreds of documents I have posted, I have hundreds of gun patents (mostly suppressors) as well as class powerpoints and targets. all for $5.