Modify have sent over details of their precision inner barrels:
Today is Friday. Do you have any activity or event on the weekends? Our popular products 6.01 and 6.03 mm Inner Barrels are available worldwide. It is made of 1st Class Stainless Steel and Aircraft Aluminum Alloy. Not only high quality material, but also extremely straight with high rigidity and accuracy. The package includes 2-Oring+ Hop Up Bucking. It makes the excellent air seal and allows the BBs smoothly go in. If you would like to know more details, please do not hesitate to contact with us or local dealer.