AR tube rifling

In my frustration the other day of trying to remove an AR out of a recon, i found that by pounding violently with a screwdriver at your AR makes a rifled barrel and can add up to 10 extra feet on to your range. So in order to do this you will need a long flat screwdriver and a barrel from your choice of gun. you first remove you AR very carefully then take you screwdriver and make little grooves in the barrel and you are done. so this rifling should add extra range and accuracy to your gun.