Exclusive in Japan! FOR AEG/ NGRS Carefully designed expert specifications Dimensional accuracy of 1/100mm Inner diameter φ6.00mm to prevent BB bullets from shaking This is a tight diameter, high-precision stainless steel inner barrel with an inner diameter of φ6.00mm and a dimensional error of ±0.01mm. This is a special specification for experts who value accuracy and air efficiency. To achieve this precision, we carefully select materials and manufacturing methods. This barrel is designed to eliminate unnecessary coatings and minimize the deviation of the bullet in the barrel.