There are alot of commercially available preparations to do this. Some require heating up the barrel and others can be done without heating. These are readily available at a hardware or gun supply store, and all come with complete instructions on the bottle. I've had best results with Hoppe's Cold Blue. The most important thing to remember is that you must have the outside of your barrel absolutely clean and degreased. Acetone or mineral spirits works well for this. The bluing chemical (selenous acid) won't work if there's the slightest bit of oil or grease...(even a fingerprint). Successive applications on the same barrel will make it darker and darker. It's easy with a little practice.
Here is a link to information about bluing or "black oxide" it's purpose and uses on guns. Hope this answers your question. you will have to copy and paste the link. http://en.wikipedia.org/wiki/Bluing_%28steel%29
Send it back to the factory or a trained professional
The reblue, even if factory, destroyed any collector value. As a shooter, it's worth about 100-300 USD, depending on how good the reblue is.
For which make & model rifle??
Would have to see how much damage was done with the reblue. If this was a restoration, instead of a reblue, the gun could still bring over $1000. If it is a typically wheel-buffed hot-salt blue - which is totally inappropriate for that gun - value is maybe $400.
200-300 USD. Maybe a little more if Colt did the reblue and you can prove it.
The collective nouns are a collection of guns, an armory of guns, or an arsenal of guns.
hand guns , long guns, Air guns , Rifle these are used as a firearms .
No. Machine guns will beat Gatling guns.
Long guns and hand guns.
usually fake guns, powdered guns, or guns without any bullets
What guns?