Posted by Desert Tactical Solutions on 1/10/2018 to
AR-15 Technical
A common question about AR-15 barrels is "Which is better, Chrome-Lined barrels or Nitride/Melonite barrels?" What are the pros and cons of each? The answer hinges on what you're using the barrel for—range plinking, competition, or heavy-duty scenarios.
Chrome-Lined Barrels
The standard M16 and M4 barrels have been Chrome-lined since the 1960s. Full-auto fire chews through bare steel barrels fast, and Chrome’s excellent wear resistance extends barrel life under that kind of abuse. It also offers top-notch corrosion resistance and is easier to clean than bare metal—though it’s not like gunk just slides off without effort. The process involves electroplating a thin layer of chromium into the bore and chamber. The trade-off? That lining can slightly reduce accuracy due to minor inconsistencies in thickness, though most casual shooters won’t notice. Over time, the Chrome can wear off, especially after a high round count or relentless mag dumps. On the outside, these barrels typically get a black phosphate coating to fend off rust.
Nitride/Melonite Barrels
Nitriding is a heat-treatment process that hardens the steel itself, boosting both wear and corrosion resistance. The most common method is Quench-Polish-Quench (QPQ): the barrel takes a molten salt bath to infuse nitrogen into the steel (Quench), gets polished for a smooth finish (Polish), then undergoes a post-oxidizing bath for extra corrosion protection and that slick black look (Quench). Melonite is just a branded version of QPQ—same deal, different name. Unlike Chrome, Nitriding doesn’t add a layer, so it doesn’t mess with accuracy. It’s also tougher to wear off, making it a champ for semi-auto fire—even rapid strings. Thanks to the polished QPQ finish, it cleans as easily as Chrome with no fouling headaches. Bonus: Nitride barrels are cheaper to produce, so they’re often easier on the wallet.
Stainless Steel Bonus
Stainless steel barrels are an accuracy favorite, especially for precision builds, but they wear out faster than treated options. Nitriding a stainless barrel gives you the best of both worlds—longer life and corrosion resistance without sacrificing those tight shot groups.
Real-World Test
The YouTube channel Mrgunsngear did a full auto torture test with two identical 4150 steel Faxon barrels—one Chrome-lined, one Nitride-treated. (Spoiler: Check the video for the gritty details.) The standout? The Nitride barrel held its accuracy better after the onslaught, while Chrome showed more wear. For semi-auto shooters, that’s a big hint.
So, Which Wins?
For most AR-15 owners without full-auto receivers, Chrome’s heat resistance edge is overkill—and its accuracy dip is a downside. Nitride delivers better long-term wear resistance for semi-auto use, holds accuracy, and costs less. If you’re building a workhorse rifle for the range or home defense, Nitride’s your pick. That said, if you’ve got a full-auto lower or plan on mag-dumping in harsh conditions, Chrome’s proven it can take the heat. Stainless with Nitride? That’s the precision shooter’s dream.
You can see all the AR-15 barrels we have at this link.
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