5.66×39mm

Photo coming soon: side view on a transparent background, with author and license.

Key specs

Type: Rifle
Origin: Soviet Union
Introduced: 1970
Case type: rimless, bottleneck
Case length: 39.50 mm
Overall length: 149.60 mm
Typical bullet: 311.7 gr

Sources

Wikipedia (ru): 5,66 × 39 мм, Wikipedia