5.45×18mm MPTs (7N7) is a Soviet pistol cartridge.^[2] It is chambered in the PSM pistol, OTs-23 Drotik machine pistol, and OTs-26 pistol.

Quick Facts Type, Place of origin ...

5.45×18mm MPTs (7N7)
Type	Pistol
Place of origin	Soviet Union
Service history
In service	1973–present
Used by	Russian military Russian police KGB
Production history
Designer	A.D. Denisova; A.I. Bochin; L.S. Nikolayeva; G.P. Shamina [1]
Designed	1969–1970
Manufacturer	Tula Arsenal
Produced	1973–present
Specifications
Case type	Rimless, bottleneck
Bullet diameter	5.63 mm (0.222 in)
Neck diameter	6.26 mm (0.246 in)
Shoulder diameter	7.4 mm (0.29 in)
Base diameter	7.64 mm (0.301 in)
Rim diameter	7.64 mm (0.301 in)
Rim thickness	1.13 mm (0.044 in)
Case length	18.03 mm (0.710 in)
Overall length	25.00 mm (0.984 in)
Rifling twist	270 mm (1 in 10.63 in)
Primer type	Berdan or Boxer small pistol
Maximum pressure	175.00 MPa (25,382 psi)
Ballistic performance
Bullet mass/type Velocity Energy 3 g (46 gr) FMJ 320 m/s (1,000 ft/s) 128 J (94 ft⋅lbf)
Test barrel length: 84 mm Source(s): C.I.P.

Close

It was designed in the Soviet Union in the early 1970s by Antonina D. Denisova at the Precision Mechanical Engineering Central Research Institute (TsNIITochmash). The development was done in concert with that of the PSM.^{[citation needed]}

The cartridge is designed to use light spitzer-pointed jacketed bullets.^{[citation needed]}

• 5.45×18mm 7N7 (7Н7): spitzer-pointed full metal jacket bullet with steel conical core.^[3] The bullet energy is stated to be up to 1.5 times that of .25 ACP in a similar sized cartridge. It is stated to be capable of penetrating 45 layers of Kevlar soft body armor at close distances.^[4]
• 5.45×18mm PSO (ПСО): spitzer-pointed full metal jacket bullet with lead core.^[5]
• 5.45×18mm 7H8 (холостой патрон 7Х8): blank cartridge^{[citation needed]}