sentences:  The hydro-pneumatic recoil system comprises a buffer below the barrel and a recuperator above the barrel.The long barrel enables a substantial propelling charge by providing more length in which to achieve 'all-burnt' and hence projectile acceleration space and thus achieve its 930 m/s muzzle velocity.The barrel is mounted on a split-trail carriage, with deep box section trails and foam filled road wheels on the ground when firing and 50° of top traverse.