It was only in the last decade or so that the MPs went to the Sig 225. Models 226 or 229 could also be found in other arms of the service. So potentially you could have an MP in an Iltis with a Sig handgun. But the 1983 date on the case makes it extremely unlikely. As the others have said, most likely a SMG-C1 fitted with BFA. There was no BFA for the pistol, and in general, you did not fire blanks from the hipowers. I won't say never, but I will say not very often.
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