chrome molly vs. hard chrome lined what's the difference ?


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marine 97-03
January 4, 2012, 12:12 AM
What's the difference in these 2

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animator
January 4, 2012, 12:14 AM
Chrome-lined refers to the chrome lining applied to the bore.


Chro-moly is a short for Chromium Molybdenum, which refers to the molecular composition of the barrel material.

briansmithwins
January 4, 2012, 12:20 AM
You can have a chrome-moly steel barrel that's lined with hard chrome.

Hard chrome adds resistance to barrel erosion and corrosion. The chamber being hardchromed aids in extraction.

There is typically a slight degradation in accuracy with hard chromed barrels. Not a issue for most people.

BSW

marine 97-03
January 4, 2012, 12:21 AM
So would a.dpms that the specs chrome molly would it be chrome lined....example the dpms. Oracle

ugaarguy
January 4, 2012, 12:27 AM
So would a.dpms that the specs chrome molly would it be chrome lined....example the dpms. Oracle
No, it would not be chrome lined. Many makers like DPMS call their 4140 steel (which has chrome & molybdenum in the alloy) Chrome Moly to deceive consumers into thinking their barrels have the more expensive Chrome Lining. Assume any barrel is not chrome lined, unless specifically stated that it is.

Tirod
January 4, 2012, 10:52 AM
It's questionable that DPMS is trying to "deceive" consumers, as much as simply inform. The problem is really that consumers simply don't know and need to ask like the OP.

Where the confusion comes in is when Marketing starts throwing around technobabble to create excitement about the product.

From the DPMS website:

Whether you are buying your first AR rifle, or need an affordable yet accurate plinking gun, the Panther Oracle™ is for you. Built to bridge the gap between the Sporting and Tactical markets, this introductory level carbine features a 16” light contour barrel, an A3 Upper receiver with Picatinny Rail, heat dissipating GlacierGuards™ and a collapsible, six-position Pardus™ buttstock.

In this example, we get a clear picture it ain't milspec. There's some key words: affordable, plinking, introductory level, and the use of Brand names to describe the handguards and stocks, instead of "military issue."

Since it's not running ammo thru it by a prospective customer so hard he replaces the bolt every year, it doesn't need the expense of chrome lining. When S&W faced this issue with there low end gun, they didn't just let it go - they nitrided the barrel, which is as good or better than chrome. Same price.

Food for thought. You don't necessarily need chrome, chrome moly, or nitriding, some shoot stainless. There's more than seeing the difference between chrome and chrome moly, there's also knowing what is preferred for what kind of shooting is done - which is much more important.

henschman
January 4, 2012, 03:39 PM
Think of chrome moly as a "plain" barrel... it is what your standard steel barrel is made of. They are the cheapest type of barrel to produce. They are also the type with the shortest service life, the least corrosion resistance, and the least "slick" finish generally.

A chrome lined barrel is a chrome moly barrel with the bore and chamber plated with hard chrome. This makes the barrel last longer, resist corrosion better, and is a "slicker" surface that aids reliability when dirty and makes it easier to clean. However it generally does not allow for as fine a tolerance in the rifling, so many CL barrels are a bit less accurate than comparable chrome moly barrels. However, Criterion (a mfg. of CL barrels) claims that their CL barrels are just as accurate as their non-chromed ones due to an improved chrome plating process.

Stainless steel barrels have a longer service life than chrome moly, but not as long as chrome lined. They do tend to make for the most accurate barrels, though. They also have better corrosion resistance and make for more reliable feeding than CM, but not quite as good as CL.

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