Good News.
Yes, the following FBP parts are interchangeable with the MP40:
- Complete bolt and spring tube.
- Barrel w/two barrel half moon retainers
- Barrel Nut
- Barrel locking shim
- Front Sling mount
Sadly, the magazines are not interchangeable.
I made a suppressed barrel assembly for my MP40 once from a complete FBP unit.
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