Patent ID: 11927417
Assignee: GLOCK TECHNOLOGY GMBH
Field: Other special machines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A firearm, comprising:
a frame;
a barrel having a barrel axis, the barrel being fixedly mounted to the frame;
a barrel extension that is connectable to the barrel;
a breech having a sliding piece; and
a gas drive configured to act on the sliding piece of the breech via one or more operating rods;
wherein the gas drive includes:
a selector, the selector being arranged on the barrel so as to be rotatable about the barrel;
an annular piston that is displaceably arranged on the barrel between a front resting position and a rear end position and which forms an expansion chamber, the expansion chamber being delimited by a ring surface and an inner cylinder surface of the annular piston, and an end surface of the selector and the barrel; where the annular piston is urged in a forward direction by one or more retaining springs; and
at least one gas port defined in a wall of the barrel in a region of the expansion chamber;
wherein the selector is rotatable about the barrel axis into at least two predefined rest positions, in which for each of the at least two predefined rest positions a gas flow from the expansion chamber into an environment is delimitable by at least one selector opening defined by the selector and a gas outlet channel of the piston.