I noticed that all the mp15s except 151 have the lower rear window on the conductor side plated over. Why are they plated over and why didn't they do 151? (unless they did and i'm looking at old photos)
#151
#155 to the right (in the original picture you can see the number board I don't know why it got cut off)
#156
#159
#151
#155 to the right (in the original picture you can see the number board I don't know why it got cut off)
#156
#159