Canon de Précision 6.03 407mm Universel + Joint Hop Up

T-N.T. inner barrels are uniquely designed from tight bore to wide bore.

specially designed grooves will create an air cusion that will guide the bb while shooting out of the barrel eliminating the contact of the bb with the barrel's sides, and then makeing sure that that same air cusion will dispurse out of the barrel before the bb is shot.

this will allow the bb shot from your airsoft gun to be untouched by that air bubble on exit, therefore eliminating the deviation usually created by it.