I took my just acquired glock 22 to the gun range for the first time yesterday. It was all over the target with no really good cluster of holes on the 50 yard range. After bringing it home I tore it down to clean it and the inside of the barrel looks pretty worn. About how much would I be looking at for a barrel that's in better shape? Is there anything I can do with the barrel I have to restore it so I would still have a numbers matching gun? Thanks in advance for any info.