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I'm looking to buy a NorthEast MP2A1 V3 or V4. It is the German Bundeswehr's version of the UZI. I searching for a V3 or V4 model only, I am not interested in the V1 or V2's as they were filled with problems which even the retrofit kits haven't fully ironed out. I am open to either the green gas or the Co2 version of t...