David had a good point. Look at an official Pam for the Thompson. I just so happen to have one on my shelf! Usually all my manuals are displayed with my field equipment but sadly I do not have a Thompson to display with my manual. Maybe one day?
In the manual it lists a 20 round and 50 round magazine available. There is no mention of a 30 round magazine!
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1942 Ford universal carrier Mk 1
1943 Ford 60 cwt long CMP ambulance
1943 Ford GPW 1/4 ton stretcher jeep
1943 Bantam T-3 1/4 ton trailer
BSA folding airborne bicycle ser#R5325 (early)
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