Nitriding a barrel

Oct 17, 2017
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#1
So I’ve been doing a whole bunch of research and trying to figure this the hell out, hoping you guys might have some input.

My goal is to have a custom barrel made, the custom aspect includes cutting 2” off and rethreading, and dimpling behind the gas block.

Where I’m running into trouble is that i want to nitride the barrel. I’ve come across threads discussing this and half the people say they have it done no problem, and the other half say that their barrel extension became loose afterwards and at best was a PITA to fix, at worst a total wash. From my understanding the problems occur if the extension is a different metal type than the barrel and the heating/cooling of the process loosens it up, and/or if the extension wasn’t properly torqued to 150 ft/lbs

I contacted H&M nitriding who have done a ton of barrels for individuals and OEM stuff, and they said doing the whole barrel is GTG.

Has anyone had a full barrel nitrided with success? The other option could be get a rifled blank and have all the mod work done, then nitride, then have extension installed + gas port drilled.

No smiths I’ve contacted will do the barrel cut/dimple on an already nitrided barrel because they say the hardness will destroy their tooling equipment, which only leaves the options I’m looking at here. I don’t mind spending the money, I just don’t want to end up with an expensive piece of worthless metal.

Appreciate any advice/knowledge you may have
 

GH41

Sergeant
Mar 18, 2014
367
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#2
I have never heard of one treated in place extension screwing itself off but have personally unscrewed one using a reaction rod in the breech while removing a muzzle device. Normally I wouldn't use the RR for that but there wasn't enough barrel forward of the handguard to get it in the vise. They cut nitrided parts everyday. There are thousands of Glock slides that have been cut for MRDS. You just haven't found the right smith yet. Just the other day on another forum a guy complaining about a nitrided barrel. The extension was unfinished and the gas port drilled after treatment. Why do the barrel anyway? What if you sink big bucks in it and it doesn't shoot?? It's not like you can shoot a couple hundred rounds and break it in. You got what you got for a long time. How many times could you cerakote it for the money you will spend?
 
Dec 26, 2006
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Austin, TX
#3
Most of the times the BE will loosen up. Just remove the BE clean the threads, apply red Locktite and torque down. I use 40 ft-lb and never had any problem. I am talking about having over 3 dozen barrels Melonited.
 
Oct 17, 2017
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#4
Most of the times the BE will loosen up. Just remove the BE clean the threads, apply red Locktite and torque down. I use 40 ft-lb and never had any problem. I am talking about having over 3 dozen barrels Melonited.
So you remove the BE entirely? Would that mess up the timing of the BE/gas port if you took it off then put it back on?

I was speaking with a gunsmith yesterday after buying a rifle off him, and was explaining what I’d like to get done and he said that the way he would do it would be to get everything ready to go extension on/gas port drilled/etc, then slightly loosen up the extension before nitriding, then do a final torque down after it’s been treated. He said he’s done many precision gas guns with that method. I’m not knowledgeable enough to know wether that’s some fudd madness or a sound procedure.
 

mtgale00

New Hide Member
Feb 4, 2018
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#6
@Drago6 - You're getting some dubious advice in this thread. I suspect your experience and toolset is well below what's necessary to realize your dream. You were given some good counsel in the thread on TOS. Lighting another fire on this forum is pointless.
 
Oct 17, 2017
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#7
@Drago6 - You're getting some dubious advice in this thread. I suspect your experience and toolset is well below what's necessary to realize your dream. You were given some good counsel in the thread on TOS. Lighting another fire on this forum is pointless.
Lighting a fire? I’m humbly asking for advice from guys more knowledgeable than myself to figure out wether the project is worth seeing through. If that ruffles your feathers it’s not my problem