Thanks for the reply, Peter. So if I understand you correctly, although this Sten came out of Fazakerley as the gun I have today, it probably comprises a number of parts that were not originally mk5 - in particular the magazine housing.

Would you have any thoughts as to what type of Sten the magazine housing would have come from given its serial number? Also, might there be any way I can establish when the gun went through the FTR process?

Many thanks for your time and patience.