S&J Hardware AR15 Barrels

Status
Not open for further replies.
Btw, I know some people have issues with AR15 barrels that have had the extension and barrel nitrited at the same time. I was assured by S&J that the extension and barrel were nitrited seperately and then assembled.
 
What was the issue with the ones that were nitrited at the same time? I purchased one awhile back and am curious what this problem might be.
 
This is from CMMG on AR15.co*

"To my knowledge we've sold AR15's with nitrided barrels longer than than anyone else on the market, so I speak from experience.

As much as we would like to nitride a barrel assembly(from a production standpoint) it's simply not the right way to do it, the loosening of the extension is only part of the problem or rather a symptom of a deeper issue.

The material and heat treatment/hardness of the barrel is notably different than the barrel extension's material and HT,keeping in mind the process of nitriding is a heat treatment precess that happens to look good and improves corrosion resistance, the barrels increase in hardness while the extensions end up softer after nitriding. There are also issues that can arise from stress induced by the mismatch of thermal expansion between the barrel and extension in the 900°+ F salt bath.

This is why we nitride our barrels and parkerize our barrel extensions, then we install the barrel extension on the barrel and make our first head space check(uppers and rifles are checked at least once more with the bolt they are test fired and shipped with)."
 
If you read the US forums your see multiple examples of barrels coming unscrewed from the extension due to treating the extension and the barrel at the same time.

Can anyone tell zombiefens the proper way to tell if his/her barrel was treated as one or treated seperately?



Ryan
 
We ran an assembled barrel through for kicks, and sure enough it didn't take much for an extension to come off. It ate the threadlocker and expanded the extension away from the threads. Because of the different materials between the barrel and extension we have to treat them separately.

Because the they're treated separately and assembled after, the gas port is the only surface of our barrels we're unable to treat as there's no way to align up a extension to a predrilled has port. Removing the extension would tell you because you'd see it there, but youd be pooching a good barrel. You could pull the index pin as well, if its treated that'd show as small parts like that are unlikely going to be nitrided on their own or it'd only be 1/2 treated if done assembled. You could have the torque confirmed if its bugging you.


Nitrited barrels are the way of the future baby. Good to see Canadians jumping up to take them for a run.
 
zombiedfens said:
What was the issue with the ones that were nitrited at the same time? I purchased one awhile back and am curious what this problem might be.
Click to expand...
As posted above nitriding the bbls with the ext instaled can lead to issue, this is somthing we had done at one point long ago, until jeff from NEA informed us this was not a good idea, i should thank him again for that titbit of info.
Our barrles and exstentions, are Gas nitride finished then assembled and a light gray oxy teflon finish applyed, to give is a cosmetic finish.
We have run into some QC issues with barrel ext sold to us buy a vendor that were not the spec we thought is was.
If anyone would liek to see one of our barrle taken apart, ryan says he has one at his shop that the pin fell out.
A few points.
our barrels are not salt bath nitride like many others on the market.
Our barrles like many other brands are warrinted for like for normal use.
I would not normaly post in another dealers fourm, but as it direcly related to our product and ryan has asked me to only post in his forum when related ot our products, i feel it was needed
bbb
 
Thanks for the post Simon, all good for something like this. As I mentioned earlier they look nice.
 
Status
Not open for further replies.
Back
Top Bottom