When it first debuted 30 years ago, the 5.7x28mm round was a bit of an oddity that flew under the radar. This .22-caliber bottleneck round more closely resembles a squat 5.56mm that bridges the gap between a rifle and pistol cartridge. In time, it became a niche caliber not unlike 41 Magnum, 10mm, or .357 SIG that have always seemed to hang on. Yet, for a myriad of reasons, the 5.7x28mm is on its way to becoming more of a mainstream pistol round as opposed to a PDW (Personal Defense Weapon) oddity.
HISTORY
In the late 1980s, as the Cold War was winding down, NATO was on a quest to find a replacement for the Heckler & Koch MP5 submachine gun and the 9mm round in which it was chambered. Fabrique Nationale Herstal (FNH or FN) took
