.22 TCM

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

Key specs

Type: Pistol
Designer: Fred Craig
Case type: rimless, bottleneck
Bullet diameter: 5.69 mm
Case length: 25.96 mm
Overall length: 32.13 mm
Typical bullet: 40 gr
Typical velocity: 853 m/s
Typical energy: 943 J
Parent case: 5.56×45mm NATO

Sources

Wikipedia: .22 TCM, Wikipedia