The zippy little 5.7x28mm round has gained a resurgence in popularity. With an AR upper, three pistols, a carbine from Ruger, a pistol carbine thing from CMMG, and who knows what else before the end of the year or at SHOT 2024 there is a renewed love for the ‘smol’ 5.56. Essentially the .30 carbine is to 30.06 is what 5.7×28 is to 5.56×45.
Anyway, the grand daddy of 5.7 carbines is the original 90’s bullpup PDW, FN’s P90. The P90 and PS90 are neat little blowback guns that hold a lot of rounds, are very compact, feed from top magazine with unique geometry, and all in all look very SciFi. The handguns tend to have a futuristic vibe too.
Anyway again to the first anyway, Brandon has a video on the OG 5.7x28mm carbine/SBR/SMG/PDW so enjoy!