The Tokyo Marui FN 57 just barely got out the door and PDI-Japan now has its .01 barrel ready for it. Always a welcome thing, given the quality of PDI products. Produced with an inner diameter of 6.01mm with ultraprecision, the processing technology is a special formula with cold forgin. The inner barrel, especially with the .01 precision barrel from PDI, should be used only with high-quality BBs as some BBs won't be able to get through with these, even if these are 6mm. Price for this barrel is JPY3,010 (US$32.28) at their website.