1928 and 1927 Auto Parts Differences
 
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Although both the 1928 and 1927 full autos were built from the pre-existing 1921, there are a few parts differences. The BATF recognizes the 1927 as a full auto, due to the fact that it can be changed back so easily. 
 
1921 Chart of Thompson Parts
 
 
Unique parts for semi-auto Colt Thompson model 1927
39. Rocker. 40. RockerPivot. 41. Rocker Plunger. 42. Rocker Pin. 43. Rocker Spring.
 
 
 
Note the milled areas, and restamping of information.
 
 
 
 
 
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The Photos and parts list were obtained from:The Unofficial Thommy Gun Page