I'm looking to get a threaded barrel for a P226 Legion. What do I need to consider when choosing between the chrome phosphate and nitride versions?
Happiness is a warm gun.
The difference is 70 years of innovation.
Chrome is non-wettable, so it cleans well and protects against rust. Phosphate aka Parkerized finishes have a large surface area to hold oils and greases for rust protection. Dry the properties are not so great.
Nitriding is a chemical surface transformation that protects against rust and abrasion. It is easier to maintain than the above system and protect the barrel better
The systems have no effect on precision. Chromed phosphated barrels were only used by the US Army. The rest of the world uses nitrided barrels.
Thank you for some good information.I was under the impression that AK-47 rifles also had chrome lined bores.
I have several SIGs (P226 Legion and some P320s) with DLC coating on the barrels and I am really impressed with this finish.
Looking at SIGs website, it does not appear that this coating is currently available on replacement barrels.
For what it's worth, chrome lined phosphated barrels are what the MK25 use. It's a mil-spec finish but the phosphate shows wear pretty quickly.
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As was pointed out in another thread, 'Nitron is DLC (applied by Ionbond)'. The fact that SIG is now selling Pistols (Classic P-series, P320, P365, etc) w/ Barrels designated as Nitron coated, AND replacement Barrels designated the same, when previously those Barrels were designated DLC is most likely just a marketing decision.
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