Originally posted by Ronnie Fry
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The B was added as a suffix when a Model 1922 M1 was upgraded by replacement of the bolt with the later type M2 bolt. An additional "I" was added after the model number making it read 1922 MII. These bolt replacements were made starting in about 1937. The bolt also required the replacing the magazine with the M2 magazine to function properly. Most of the 1922 M1 issue type stocks were replaced with the M2 stock when the conversion occurred.
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