Dont get me wrong i adore star wars but being a militaria collector and re-enactor I spot the 'donor' parts for star wars guns so easily (and some of them are *very* lazy)
Like stormtrooper E11 blaster are Sterling SMGs with a sight and some rails added.
Heavy blasters are mainly Mg34a
Hans DL44 is a Mauser C96 pistol
The sandtroopers 'concussion rifle' is a wwi/wwii lewis gun with no magazine fitted.
Rebel rifles are a hybrid of Mp44 parts with some AR15 parts (IIRC)
Anyone else spot the 'real world' weapons under the gubbins when they watch the movies