5.45x39mm US gs
A 5.45x39mm US gs (GRAU Index - 7U1) cartridge with a 5.1 gram subsonic bullet with a pointed tungsten carbide core over a lead base with a bimetallic jacket, in a steel case with a reduced charge. This US cartridge (Umén'shennoy Skórosti - "Reduced Speed") was designed by TsNIITochMash in the mid-1980s for use in the AKS-74UB and AKS-74UBN models in conjunction with a suppressor, ensuring the weapon's fire cycling and achieving an excellent noise reduction in addition to granting a considerable stopping power effect, but despite the composition of the bullet, it has difficulties to piercing basic ballistic body protections and due to its design, it has a high bounce probability off various surfaces.
| Range | Velocity | Damage | Penetration Power | Drop | Time Of Flight |
|---|---|---|---|---|---|
| 50 m | 294.63 m/s | 64.11 | 14.8 | 14.2 cm | 0.17 s |
| 100 m | 287.14 m/s | 63.3 | 14.61 | -0.0 cm | 0.35 s |
| 150 m | 279.95 m/s | 62.53 | 14.43 | -45.18 cm | 0.53 s |
| 200 m | 273.35 m/s | 61.82 | 14.27 | -120.69 cm | 0.71 s |
| 250 m | 267 m/s | 61.14 | 14.11 | -232.62 cm | 0.9 s |
| 300 m | 261.09 m/s | 60.51 | 13.97 | -377.04 cm | 1.09 s |
| 350 m | 255.6 m/s | 59.92 | 13.83 | -553.35 cm | 1.28 s |
| 400 m | 250.22 m/s | 59.34 | 13.7 | -772.86 cm | 1.48 s |
| 450 m | 245.16 m/s | 58.8 | 13.57 | -1,026.61 cm | 1.68 s |
| 500 m | 240.18 m/s | 58.27 | 13.45 | -1,329.35 cm | 1.89 s |