Gas powered gun

A gas powered gun for discharge of projectiles, comprising:

• a barrel adapted to receive a projectile,
• a pressure chamber adapted to communicate with a compressed gas source,
• an open-close valve arranged in a rear end of said pressure chamber, and arranged, in its open state, to allow passage of gas from said pressure chamber into said barrel, to thereby discharge said projectile,
• said open-close valve comprising a valve seat and a valve head adapted to sealingly abut said valve seat to close said valve, said valve head being provided in one end of an elongated extension member, and
• a hammer arranged to cooperate with a hammer cooperating member provided at a second end of said elongated extension member, wherein
• said elongated extension member extends in a firing direction of said gun through said pressure chamber, and
• said hammer is arranged between said valve head and said hammer cooperating member, so that, when said hammer is moved in the firing direction into contact with said hammer cooperating member, said hammer cooperating member pulls said valve head out of contact with said valve seat, thereby bringing said open-close valve to its open state.