Caliber: 5.7x28mm Weight: 3kg loaded with magazine with 50 rounds Rate of fire: 750to 900 rounds per minute magazine capacity:50 rounds range: 200 meters. The t57 PDW is manufactured by the Turkish MKE technical and mechanical facility it is heavily based on the U.S. M-16 assault rifle, It is sold either fully assembled, or upper receiver only. The upper receiver assembly can fit on any M16 or AR-15 receiver. The magazine well is used on this weapon as a way to throw out spent cartridge brass. It was adopted by the Turkish military/law enforcement agencies for experimental use.