Product Name : Cubot J3 .22LR Bar Pistol (3D Print Kit Gun) Manufacturer : Imura Industry (Japan) Designer : Yoshitomo Imura Designed : 2019 Material : PLA / ABS / Stainless Steel Caliber : .22 Shoot : 2 Barrel Type : Lifering Barrel Barrel Length : 50.8mm (2inch) Lifering Barrel Groove or Corner Number : 12 Lifering Barrel Twist Direction : Right Lifering Barrel Twist Angle : 50.8mm (2inch) ⇔ 45° Parts that need to be purchased Φ3.3 Drill M4 TAP Φ3.0 (Outer Diameter) Φ0.3 (Inner Diameter) L5 Spring Φ4.0 (Outer Diameter) Φ0.4 (Inner Diameter) L20 Spring 20×4×1 Spring Plate M4 L5 Set Screw ×2