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Over 90% of high-grade match barrels are made from Stainless Steel. Stainless is easier to machine because it is slightly softer. It is also easier to apply a fine, hand-lapped finish to a stainless bore. That said, chrome-moly barrels can be just as accurate, when made correctly,
A never ending debate that won't be solved anytime soon. Some barrel makers (regardless of the type of steel) guarantee accuracy, while others do not. Even when guaranteed, the guarantee depends on criteria such as the type of ammo being used and the shooting style.
For a quality AR (not a factory production AR) with a good barrel, most shooters should expect 1" MOA at 100 yards when using bench-rest style shooting techniques and premium match grade ammo. Free hand shooting of cheap steel case ammo will certainly not produce consistent accurate results, regardless of the quality of the AR.
All things equal, barrel life is extended when using stainless steel. Chromoly is low-alloy steel that contains chromium and molybdenum, along with the iron, carbon and other elements. The chromium adds strength, hardenability and a level of corrosion resistance to mild carbon steel, though Chromoly is not as corrosion resistant as stainless steel.
Stainless steel is stronger, more corrosion resistant, abrasion proof, and has more barrel life before accuracy degrades to the need for a barrel change. There is not any real documentable proof either way. A lot more boils down to the manner of rifling and overall quality of the barrel itself.
At SPARTAN AR, we prefer stainless steel barrels, hands-down. We do offer some models and barrels in chromoly, but our mainstay is stainless.
Due to different customer expectations and definitions of accuracy, it's not possible for us to "guarantee" accuracy. That being said, SPARTAN AR barrels are the most accurate production barrels on the market. Our expectation for barrels 16" or longer is to hold a 1.00" MOA at 100 yards with cold barrel, premium match grade ammo and professional bench-rest style shooting techniques.
Barrels are manufactured from two types of steel.