RE: HELP, barrell rust removal
Many times if it is only surface rust only minor steps need be taken to remove it. You could try something as simple as swabbing with a quality solvent and then oil the barrel but that might not do the trick depending on the degree of the surface rust.
Get some J-B Bore Paste and a scotch brite scrub pad. Cut off a small amount of the scrub pad and put that on your patch worm. Then coat the outside of the pad with the bore paste and scrub the bore about 15 strokes. Add more paste and do another 15 strokes. After that clean the barrel with soap and water, then some solvent patches and apply a high quality gun oil like Birchwood Casey Sheath, REM OIL w/teflon or Breakfree CLP. Let it sit with a heavy coating of oil muzzle end down for a couple days then swab the excess oil out with some dry patches. The surface rust should be gone and the barrel should shine bright now....