While Gunplumber knows his shit, I really have a hard time taking his position on nitriding seriously. He basically claims that it does little more than change the appearance of the steel, and does nothing whatsoever for corrosion resistance or hardness. This seems to go against all testing that has been done on the process.
Just in the AK world alone, there are several militaries that currently issue AK derivatives which utilize a nitride process for barrel steel - Poland (Beryl) and Switzerland (SIG 55x). The Swiss have used this process for decades on the 55x series of rifles, and those rifles are considered by many to be some of the most accurate and durable service rifles out there.
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I'm fine with nitride for a range toy like an AR
, they may even be a tad bit more accurate. But there is zero chance they are more corrosion resistant, and if god forbid you ever had to use your rifle in a serious all-out SHTF situation i'm pretty sure you would sleep better knowing it was chrome-lined. Chrome-lining is NOT just to resist corrosion, it aids in extraction, this is really the most important point and is usually ignored by people preaching the about the benefits of nitride.
But go ask a Vietnam era vet about the difference between chrome-lined and non-chrome-lined barrels sometime.
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There was way more of a systemic failure with the first M16s than a simple issue of barrel steel & coatings. The original Colt design specified chrome lining of the bolt carrier, bore and chamber.. Army Ordnance Dept. called for all of that to be eliminated in production to save cost. Then, to further count beans, they didn't even have the first lots of 5.56 ammunition loaded to the correct spec provided by Colt, and as a result the ammo was spectacularly filthy and never burned properly in the early M16, leading to many instances of squibs and FTEs related to short stroking and chamber fouling.
IOW they sent a rifle with NO anti-corrosion properties whatsoever into a harshly corrosive environment, and issued cartridges that were highly dirty and ran underpowered in the rifle.
That is a long tale of institutional fuckups that fall square on the lap of the US Govt. I'm not a massive M16 fan but the design as specified by Colt, with the specified ammunition, would likely have worked just fine in Vietnam and would have saved many lives had the Army not try to fuck with it to save money.