This video shows the three upgraded parts that I bought from MFI. The original parts from GSG are not the best quality and are historically inaccurate, so for a reenactor or anyone who wants a more authentic looking mp40 I would highly recommend purchasing these parts. They are somewhat expensive but if you want that better look then they're worth it.
MFI parts are available on their website and the owner Michael ships pretty fast: www.mfiap.com/c-1181070-pisto...