There is usually no problem with removing a dent in Damascus barrels, especially one that close to the muzzles where pressures are much lower than near the chambers. A sharp crease is worse than a more shallow rounded dent because it will take more striking to remove the damage after raising the dent. Expect to spend at least $50 just to remove the dent, and much more if the barrels need to be refinished afterwards.
An important question to ask with any old Damascus gun is whether the barrels got dented because they had been previously honed to remove pitting and now have thin barrel walls. Thinner barrels are naturally more easily dented. Try to get your barrels measured for wall thickness before you plunk down your money. There are lots of old threads here dealing with acceptable barrel wall thickness at various points along the barrels.
