Attachment 65411Attachment 65412Attachment 65413

Jim, The Marines might have also took some of those Colt 100 rd drums too that were with the Post Office Dept Thompsons. The large drum was more common with the gangsters than the military. Photo shows a Colt drum that was said to come from Chicago.

The Model 1928A1 bolt has a field modification which consisted of a second notch cut into
the bottom of the bolt which would allow the safety to be applied while the bolt was closed.

Some say this was done by Britishicon armorers while other say it was done by US paratroopers, I am certain both could have performed this modification. The M1 and M1A1icon both had this second notch on production bolts.