Claridge Hi-Tec/Goncz Pistol

The Claridge Hi-Tec and its antecedent, the Goncz High-Tech Long Pistol, are semi-automatic pistols designed by Hungarian inventor Lajos John Goncz. This unique firearm features a telescopic bolt design encased in a tubular upper receiver with a forged steel frame, button rifled match barrels, and 16-round magazines standard.

Source: Wikipedia — Claridge Hi-Tec/Goncz Pistol (CC BY-SA 4.0)