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I have no idea. I'm sure there is something you can do but the b.b. part. I use Hornaday black diamond b.bs. there the ones that work with the mp 40. If there are others that work with it please let me know.

Here's a pick of my mp40

Does anyone know what the older umarex mp 40 is vallued at? I have one with two mags. There the original mags not altered.

I use straws.