This video provides a direct comparison between the early Swedish m/45 and the improved m/45B submachine guns. It details the key design changes implemented in the m/45B, including sturdier barrel shroud holes, a permanently riveted magazine well guide (due to the removal of quad-stack magazines), and a strengthened receiver endcap and buffer to accommodate hotter m/39B AP ammunition. The description also notes that the m/45B variant received a durable green paint finish over its parkerizing, and that most earlier m/45s were updated to the m/45B standard.
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