Brown residue when cleaning a new nitrided Glock slide - Page 1

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[ARCHIVED THREAD] - Brown residue when cleaning a new nitrided Glock slide

Posted: 2/14/2022 10:20:59 PM EDT

I bought a new aftermarket slide for a Glock that is nitride finished.

When cleaning the slide I noticed a brown residue that appears much like rust. The finish on the slide itself looks perfect.

I know on some of the 870 expresses (different finish, I know) this was actually rust from residue left over from finishing process and it was a good idea to get it off as much as possible.

Is this also rust? Should I continue to remove as much as possible or just let it be?

Posted: 2/14/2022 10:28:54 PM EDT

[#1]

Leave it
If im not mistaken, it is a compound put there by factory to polish slide and lower receiver rail interface during initial break in period

ETA
Just read "aftermarket"
What was said above applies to glock factory, perhaps the mfg maintained the same logic?

Posted: 2/14/2022 10:32:10 PM EDT

[#2]

Quoted:
I bought a new aftermarket slide for a Glock that is nitride finished.

When cleaning the slide I noticed a brown residue that appears much like rust. The finish on the slide itself looks perfect.

I know on some of the 870 expresses (different finish, I know) this was actually rust from residue left over from finishing process and it was a good idea to get it off as much as possible.

Is this also rust? Should I continue to remove as much as possible or just let it be?

View Quote

It's not rust, it's an oil residue commonly encountered on nitrided parts, it's kind of the end step of the process and most of the nitride places just leave it on there. I'd suggest removing it with your favorite degreaser, I found denatured alcohol to work well.

Posted: 2/14/2022 10:41:58 PM EDT

[#3]

Quote History

Quoted:
Leave it
If im not mistaken, it is a compound put there by factory to polish slide and lower receiver rail interface during initial break in period

ETA
Just read "aftermarket"
What was said above applies to glock factory, perhaps the mfg maintained the same logic?

View Quote

I know what you’re referring to and its not that brown/grease like on new Glocks. This slide was initially bone dry. What I’m talking about is not visible initially until you start oiling/cleaning. And it’s present all over the slide including the exterior surfaces.

Posted: 2/14/2022 10:44:28 PM EDT

[#4]

Quote History

Quoted:

It's not rust, it's an oil residue commonly encountered on nitrided parts, it's kind of the end step of the process and most of the nitride places just leave it on there. I'd suggest removing it with your favorite degreaser, I found denatured alcohol to work well.

View Quote

Thanks. I have a couple of nitrided AR barrels and they are pretty glossy, whereas this slide is pretty matte.

I assume cleaning off this residue might make the finish more shiny?

Posted: 2/14/2022 10:45:38 PM EDT

[#5]

Quote History

Quoted:

It's not rust, it's an oil residue commonly encountered on nitrided parts, it's kind of the end step of the process and most of the nitride places just leave it on there. I'd suggest removing it with your favorite degreaser, I found denatured alcohol to work well.

View Quote

Just got a Right To Bear 22 barrel and same thing when wiping it down, I degreased it, oiled it and moved on.

Posted: 2/14/2022 10:46:35 PM EDT

[#6]

It’s residue from the Nitride process. The finishers will remove that with plastic media blasting once the finishing cycle is complete, but it’s not uncommon for some residue to remain. We went through a couple iterations of process improvements with our Nitride vendor before getting a satisfactory result on our Gas Controls. The insides of holes or grooves are particularly susceptible to residue. Check those inside crevices and holes for residue and clean as needed.

Posted: 2/14/2022 11:30:08 PM EDT

[#7]

you need to go visit this thread..... https://www.ar15.com/forums/general/Wont-lie-seems-weird-shooting-a-stream-of-water-on-my-butthole-/5-2530568/
he may have your cleaning solution