it should be rifled barrel.if your going to strip it you can brush it but will be diff if not but still can be done.you will need to take out pellet loading tap to do it tho.i brush barrels if really bad.never noted and damage.but yours sounds bad im sure.not a deep rifling on them but better than some.nice rifle tho.i love them.oh will be harder to pull back out as the brush hasnt totaly left the b arrel i use a worn brush for such a situation.