A half-circular double stapler which allows application of wire stitches and resection of the rectal prolapse without the need of using two circular staplers is provided. A fastener-pushing system is divided into two bodies which can be activated independently, each body having a semi-circular shape. The stapler has a gun-shaped handgrip, a pair of triggers and a cursor arranged laterally for a quick closure of anvil and feeder. The stapler also has a switching button arranged between the first and the second fastener-pushing bodies.