Just drag all parts in and take away the magazine, as you won't be able to flip the gun in with magazine inside of. Part three, which opens at degree twelve, demands you to modify an MP5 to adjust to specified requirements. You should purchase an MP5SD or acquire it https://ammunitionsdistros.com/product/american-tactical-milsport-300-blackout-optics-ready-semi-automatic-rifle-with-mlok-rail/