From German - English Ding/FreeDict dictionary ver. 1.9-fd1:
Maschinenpistole /mˌaʃiːnˌɛnpɪstˈoːlə/ (MP /ˌɛmpˈeː/, ) (MPi /ˌɛmpˌeːˈiː/) <fem, n, sg>
[mil.] sub-machine gun <n>SMG, /ˌɛsˌɛmɡˈeː/
"Thompson-Maschinenpistole" - Thompson submachine gun, tommy gun, drum gun, Chicago submachine, Chicago typewriter, annihilator
"Bezeichnung für die M3-Maschinenpistole" - grease gun
see: Maschinenpistolen