9×21mm Gyurza

Type Pistol
Place of origin  Russia
Service history
Used by FSB
Russian Army
Production history
Designer TsNIITochMash
Produced 1990s to the present
Variants SP-10 (7N29), SP-11 (7N28), SP-12, SP-13 (7BTZ)
Case type Straight walled, rimless
Bullet diameter 9.05 mm (0.356 in)
Shoulder diameter 9.6 mm (0.38 in)
Base diameter 9.9 mm (0.39 in)
Rim diameter 9.9 mm (0.39 in)
Rim thickness 1.2 mm (0.047 in)
Case length 20.9 mm (0.82 in)
Overall length 32.7 mm (1.29 in)
Ballistic performance
Bullet mass/type Velocity Energy
6.7 g (103 gr) 7N29 410 m/s (1,300 ft/s) 563 J (415 ft·lbf)
7.9 g (122 gr) 7N28 390 m/s (1,300 ft/s) 601 J (443 ft·lbf)
7.2 g (111 gr) 7BTZ 395 m/s (1,300 ft/s) 562 J (415 ft·lbf)
Source(s): Modern Firearms

The 9×21mm Gyurza (Гюрза, Russian for "blunt-nosed viper") round is a Russian handgun round designed to defeat body armor that was developed by TsNIITochMash for its SR-1 Vektor semi-automatic pistol and SR-2 Veresk submachine gun.


SP-10 (7N29) - armor-piercing bullet with hardened steel core[1]

SP-11 (7N28) - standard FMJ bullet with lead core

SP-12 - low ricocheting, expanding bullet[2]

SP-13 (7BT3) - tracer AP bullet based on 7N29



The method of construction of the rounds allows them to be effective against both unarmored and armored targets. The bullet has a hard sub-caliber core contained within an outer sleeve and separated from it by a polyethylene layer. If the bullet strikes an unarmored target, it holds together to produce a wide wound channel. If the bullet strikes an armored target, the sleeve is stripped away and the core penetrates alone. The 7N29 AP loading fires a 6.7 g (103 gr) bullet at 410 m/s (1,300 ft/s) with 560 J (410 ft·lb) of force, and will reportedly penetrate two 1.2 mm titanium plates, plus 30 layers of Kevlar, at 50 m (160 ft). The disadvantage of the rounds is that high impact velocities are needed for them to work effectively, so the bullets are relatively light to maximize their muzzle velocity. This means they will lose velocity relatively quickly, limiting their effective range.[3]


External links

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