- Ball bearing quality design
- Polished to perfection
- Diameter: 5.87mm +/- .01mm Tolerances
The KSC bbs are made smaller with diameter of 5.88mm + 0.01mm, which is the preferred diameter for KWA / KSC USP and MP9 / UMP series Airsoft Gas Blowback GBB that are designed to work best with 5.88mm and smaller bb sizes.
FAQ: Most Taiwan and Japan made precision bbs averages 5.90~5.95mm in diameter. Common AEG barrel sizes are 6.00~6.10mm in diameter including KWA rifles and pistols. The magazine feeding chamber of the KWA MP9, TMP and USP series works best with KSC bbs.