Evike.com tests the accuracy that you can get with the Prometheus Tight Bore Inner Barrels from Laylax which they have available... "In Greek mythology, Prometheus created man-kind and stole the power of fire from Mount Olympus and gave it to man-kind. The Myth has little to do with this product but it is a cool story Prometheus-Airsoft would like to share with you. Nevertheless, this is an awesome AEG tight bore barrel favored by many.

Evike.com now distributes Prometheus products directly from Japan to bring you the newest version, factory direct."