Well, post-WW2 there's not much for new weapons since Prohibition, so I don't see the problem with the M1 Carbine. There isn't anything other than Thompsons and BARs to issue, and I can't see why they'd adopt the M1A1 model Thompsons, it was a simplified military adaptation that offers no real benefit over the M1928A1. Frankly, there's no new weapons technology for the FBI in the 1950s, with the possible exeption of the M1 Carbine and M3 Grease Gun, so weaponry would most likely be unchanged from the 1930s to at least 1960. Until the Uzi, MP5, and M16 start showing up, FBI and law-enforcement weaponry is going to be stuck in stasis from the Prohibition era.
The BAR is heavy, but if you want real firepower, that's what's availible and the Garand is never going to replace it. While not normally used, it's heavy firepower will see it getting dragged out of the gunsafe to catch the hit squad. Asside form the machine pistol, none of the ideas are ripping off movies, they're simply stuck with the same weapons as that era
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