Demilled 1928A1 Thompson markings

[garthok]

Attachment 45200Attachment 45201Attachment 45202Attachment 45203

Its one of the kits that comes missing the center piece, the POL mark is on the part the barrel screws into. I wish I had the serial. It has the quick detatch stock with reinforceing bolt, and lyman adjustable sight, and cutts compensator, so possibly early wartime? I cant find a source that tells when these features were added then removed to narrow down the date range.