A gun comprising: a gun body, a bolt which is provided to be movable forward or backward in the gun body, accumulates a pressure of a buffer spring while moving backward according to manipulation of the gun, and moves forward by releasing the accumulated pressure, a bolt stop shock-absorption device comprising: a bolt stop member which is configured to stop the bolt moving forward, wherein the bolt stop member includes engagement means which is configured to engage with the bolt moving forward, a shock-absorption means which acts on the bolt stop member to absorb an impact force applied to the bolt stop member by the engagement means, wherein the bolt stop member configures a bolt stop portion interposed between the bolt and the shock-absorption means, includes a long hole in a front-rear direction in which a shaft provided on the gun body side is disposed, is movable within a range of the long hole, and is rotatably provided about the shaft, and the engagement means includes an engagement portion provided in the bolt and an engagement partner portion provided in the bolt stop member and is provided to form an acute angle in a forward movement direction of the bolt. a gun body, a bolt which is provided to be movable forward or backward in the gun body, accumulates a pressure of a buffer spring while moving backward according to manipulation of the gun, and moves forward by releasing the accumulated pressure, a bolt stop shock-absorption device comprising: a bolt stop member which is configured to stop the bolt moving forward, wherein the bolt stop member includes engagement means which is configured to engage with the bolt moving forward, a shock-absorption means which acts on the bolt stop member to absorb an impact force applied to the bolt stop member by the engagement means, wherein the bolt stop member configures a bolt stop portion interposed between the bolt and the shock-absorption means, includes a long hole in a front-rear direction in which a shaft provided on the gun body side is disposed, is movable within a range of the long hole, and is rotatably provided about the shaft, and the engagement means includes an engagement portion provided in the bolt and an engagement partner portion provided in the bolt stop member and is provided to form an acute angle in a forward movement direction of the bolt. a bolt stop member which is configured to stop the bolt moving forward, wherein the bolt stop member includes engagement means which is configured to engage with the bolt moving forward, a shock-absorption means which acts on the bolt stop member to absorb an impact force applied to the bolt stop member by the engagement means, wherein the bolt stop member configures a bolt stop portion interposed between the bolt and the shock-absorption means, includes a long hole in a front-rear direction in which a shaft provided on the gun body side is disposed, is movable within a range of the long hole, and is rotatably provided about the shaft, and the engagement means includes an engagement portion provided in the bolt and an engagement partner portion provided in the bolt stop member and is provided to form an acute angle in a forward movement direction of the bolt.