This is my Finnish captured DP28 dated 1941, the stock does not feature the usual semi-circle woodwork but instead is fitted with a stock similar to a cut down Suomi K31.
I think the upper and lower receivers are from different guns.
I got it with the SA marked metal 3 magazine carrying case too.
Sorry for the bad focusing.
Is it normal for these that the deac certificate says the Country of Origin is Russia?