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MadBull Airsoft again applies its Black Python Tight Bore technology to bolt action sniper rifles. The new design of Tight Bore barrels are for Echo1 M28/ VSR-10 style bolt action rifles. Based on our tests, the 6.03mm Black Python Tight Bore barrel can enhance velocity by at least 15%, needless to mention the upgraded accuracy. Enjoy the MadBull’s famous Black Python Tight Bore technology!

Main Function: to eliminate gap between rail and upper receiver. These washers will ensure a contour fit between barrel nut and upper receiver, eliminating misalignment and RIS instability. The MB Barrel Nut Washers come in 4 sizes to fit many different configurations.

Black Python BP363 363mm Tight Bore Barrel 

Black Python BP455 455mm Tight Bore Barrel 

Black Python BP650 650mm Tight Bore Barrel