Unquestionably the most technically advanced precision machined barrel system ever designed. Every back half in the set is measured three times for accuracy and engineered to greatly increase the performance of your marker and game. This powerful combination, combined with ceramic coating, promotes reduced friction and increases the accuracy level of your gun tremendously. The top of the line Edge System to make you the ELITE player. You'll be able to shoot every brand of paint on the market with complete accuracy. With 5 control bores .682, .685, .688, .691, .693 and a 10', 12', and 14' front.