https://www.independent.co.uk/news/uk/the-sleazy-state-royal-ordnance-exported-weapons-to-east-germany-arms-deals-1429337.html
This was a article done that led me to wonder this. As described in the article the MP5 in question was produced in 1985 and contains the Enfield stamp En instead of EN...
Well Gents, Starting my first mp5 build this week. Reciever and parts kit comes in Monday, hopefully will be welded up and ready for me to cerakote by the weekend. Anyone here built any roller lock goodness and have any tips or tricks?