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Posted: 7/8/2007 10:02:57 PM EDT
| Will the 50 rd drum magazines made by Auto-Ord for the 1928 model work in my 1921 Thompson? |
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Yes, but you may want to read up on the quality issues that these drums have had. Most people have experienced poor results with these out of the box, and the problems will be more acute in a 1921 Thompson given your high rate of fire. Better to find a WW2 drum, which can be had for less than $500 now. |
| I should add, there are a bunch of reproduction Crosby drums that are reputed to be excellent quality for under $300. Ask around at www.machinegunbooks.com |
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Yes, the 21 and the 28 models are both cut horizontally for drums at the front of the receiver. Different winding instructions appear on different drums (Wind 11 clicks for Model of 1921, Wind 9 clicks for Model of 1928) The main difference between the 21 and 28 is the rate of fire in the 21 is significantly faster. This means the drum must work better to more quickly have the next round in position for feeding. As far as I know, all WW2 or earlier drums work well in the 21 and 28. Preban west hurley drums tend to work fine in a 21, but many post-ban production auto-ordnance drum do not work well in 28s, let alone 21s. In the opinion of some very knowledgable Thompson RKIs those past-ban drums are garbage. The Crosby repro drums are supposed to work fine in both models, there are videos of those drums in action at the link I posted above. Note the above commentary is on "L" drums (50 round) only. "C" drums have a different set of rules. |
Good lord! I could CNC machine them in aluminum for less than that. 
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Here's where to get WW2 drums for under $500: www.machinegunbooks.com/forums/invboard1_1_2/upload/index.php?act=ST&f=3&t=8411&s=504201c6d0ae07958513443f9c499845 |
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