Multi-shot airgun

An airgun comprising:

• a tube fork having front face with a port from which a compressed gas can flow;
• a barrel having a passageway through the barrel with an opening at a back barrel face, with the passageway sized to receive a projectile;
• a pivot joining the barrel to the tube fork such that the barrel can be moved between a firing position and a cocking position;
• a shuttle positioned between the port and the barrel, the shuttle having a shuttle passageway with a front end of the shuttle passageway that is larger than at least one of the barrel passageway and the port;
• a shuttle drive system configured to allow the shuttle to move so that the shuttle passageway is moved between a first position where a front end of the shuttle passageway overlaps the opening and where a back end of the shuttle passageway overlaps the port, and a second position where the shuttle passageway overlaps a loading opening of a projectile loading system;
• and,
• a breech bushing partially in the shuttle passageway and having a breech bushing channel sized to receive the projectile;
• wherein the barrel has a barrel guide surface at the back barrel face, wherein the breech bushing has a shaped surface facing the barrel, and wherein the breech bushing shaped surface and the barrel guide surface are configured to interact as the barrel is moved from the cocking position to the firing position to urge a breech insert to move within the shuttle passageway in a manner that reduces any misalignment between the breech bushing channel and the opening.