This video provides a detailed comparison between the original Swedish K m/45 and the improved m/45B variant. Key differences highlighted include the m/45B's more durable green paint finish over parkerizing, a permanently riveted magazine well optimized for 36-round magazines (unlike the m/45's detachable well for both 50 and 36-round mags), and a reinforced barrel shroud with smaller vents for increased integrity. The m/45B also features upgraded receiver components and a spring buffer to handle higher-pressure m/39B ammunition.
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