Vursan 92A semiauto. Uses benelli super 90 operating system. Vursan was purchased by Stoeger. Need recommendations on what parts to replace to correct the problem of firing the first shell, ejects the shell strongly, the second shell remains in the magazine tube, push the indicator button on the side of the trigger guard and the shell flys onto the carrier and hitting the bolt release loads the shell in the chamber. The action tube in the stock is clean.