|Type||Handgun, submachine gun|
|Place of origin||China|
|Case type||Rimless, Bottleneck|
|Bullet diameter||6.00 mm (0.236 in)|
|Neck diameter||6.57 mm (0.259 in)|
|Shoulder diameter||7.77 mm (0.306 in)|
|Base diameter||7.95 mm (0.313 in)|
|Rim diameter||7.97 mm (0.314 in)|
|Rim thickness||1.13 mm (0.044 in)|
|Case length||21.00 mm (0.827 in)|
|Overall length||32.50 mm (1.280 in)|
|Test barrel length: Pistol* and Submachine Gun**|
The cartridge was designed for replacements of 7.62×25mm Tokarev-chambered small arms for the People's Liberation Army that would offer a wound as large as a standard 9×19mm Parabellum round. This round is offered in both a standard, and subsonic version. Both the QSZ-92 service pistol and the QCW-05 submachine gun are produced in this caliber as well as 9×19mm Parabellum.
The 5.8×21mm is considerably less powerful than similar Western PDW cartridges like the 5.7×28mm and 4.6×30mm. It has a steel-cored 3 g (46 gr) projectile that has a muzzle velocity of 530 m/s (1,700 ft/s) and muzzle energy of 420 J (310 ft⋅lb) from a submachine gun barrel. The round can penetrate 1.3 mm (0.051 in) of helmet steel plate, and 50 mm (2.0 in) of pine wood behind it, out to 100 meters.
- "5.8x21 / MUNICION.ORG". Retrieved March 23, 2012.
- Handgunsmag.com. Retrieved 3 April 2013.
- Fortier, David M. (September 24, 2010). "Military Ammo Today". Guns & Ammo. Retrieved September 25, 2012.
- Popenker, Maxim. "Modern Firearms - QSZ-92 pistol". World Guns. Retrieved September 25, 2012.
- Popenker, Maxim. "Modern Firearms - Type 05 submachine gun". World Guns. Retrieved September 25, 2012.
- Where Next For PDWs? by Anthony G Williams Archived 2014-07-14 at the Wayback Machine