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gun metal

Stainless steel is slightly heavier (denser) as a matter of science, but its not a difference you can feel. For each 5 cubic centimeters of steel in your gun, stainless would add 1 gram to the weapon's weight.
1 gram is 1/28 of an ounce.
 
The real benefit of stainless is corrosion resistance. If it's just a blued barrel it's wise to run a wet ( oil ) cloth down the bore to further enhance the corrosion resistance of the bluing. With today's coatings, chrome lined, melonite, parkerized, nitride and a few other really staves of corrosion so it's pretty much a wash initially. Over an extended period of time the stainless will hold where some of the coating can wear off. However, that takes along time and many, many rounds. Generally carbon steel barrels meet or exceed the minimum requirements of the barrel maker or mil spec barrels so it's really up to you. A well coated barrel on the outside with chrome lining will give the longest service in terms of rounds. I have however, seen many mil spec barrels start surface rusting on the exterior. That's takes quite a few years and neglect to have that happen.

It's worth noting that are two types of stainless that barrels are made of. 416 and 410 stainless. 416 is more desired because of readily maintainability. 410 Stainless is a little harder and will last longer but it is harder to work with so you won't see a lot of 410 stainless barrels. Bravo Company offers stainless barrels in 410 stainless. It's little harder for better wear but is harder to work with.
 
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