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Posted: 6/23/2019 8:26:56 AM EDT
I've been a faithful user of parked bolts and only recently started using nitride bolts. Is this to be expected of nitride? This may have 1k-1.5k on it.
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Posted: 6/23/2019 8:30:54 AM EDT
[#1]
Looks fine to me.
I honestly don't see the wear you are referring to. |
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Posted: 6/23/2019 8:59:51 AM EDT
[#2]
Hard to tell if it is different than my high mile nitride. I have never shined a high power spotlight at mine, or cleaned it that much.
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Posted: 6/23/2019 9:21:11 AM EDT
[#3]
I think OP means the end of the bolt/the bolt face has wear. That looks normal to me.
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Posted: 6/23/2019 9:35:02 AM EDT
[#4]
The benefit of nitride is that even if the surface finish wears off, the bolt's base metal itself is hardened and protected so many microns deep from the nitride treatment. So even if you see wear spots where it's not black, the metal is still hardened and corrosion resistant.
Now, the problem with nitride is that improper application can allegedly mess up with the original metal's heat treatment, leaving an ultra hard surface layer, with a softer metal core of the part. |
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Posted: 6/23/2019 10:01:14 AM EDT
[#5]
Looks fine to me. I honestly don't see the wear you are referring to. |
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Posted: 6/23/2019 10:06:51 AM EDT
[#6]
OPs issue is the the black has worn off. Does that mean we’re dealing with bare, untreated metal now?
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Posted: 6/23/2019 10:26:54 AM EDT
[#7]
Quote HistoryQuoted:
OPs issue is the the black has worn off. Does that mean we’re dealing with bare, untreated metal now? OP, your bolt face looks normal. |
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Posted: 6/23/2019 10:57:09 AM EDT
[#8]
I don't see a problem.
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Posted: 6/23/2019 11:09:31 AM EDT
[#9]
Quote HistoryQuoted:
OPs issue is the the black has worn off. Does that mean we’re dealing with bare, untreated metal now? I have other nitride bolts with more rounds on them with less finish worn off. It sounds like I'm viewing nitride incorrectly as a surface finish. |
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Posted: 6/23/2019 11:15:28 AM EDT
[#10]
Who manufactured the bolt?
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Posted: 6/23/2019 11:16:58 AM EDT
[#11]
Quote HistoryQuoted: Bingo I have other nitride bolts with more rounds on them with less finish worn off. It sounds like I'm viewing nitride incorrectly as a surface finish. |
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Posted: 6/23/2019 11:29:40 AM EDT
[#12]
Two possible answers:
That's the inner nitrogen diffusion layer beneath the outer iron nitride layer, or it's chrome wearing off the barrel extension onto the outer iron nitride layer of the bolt. |
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Posted: 6/23/2019 11:37:40 AM EDT
[#13]
'N'/sample size = 1 for me so please take this with the appropriate grain of salt, but I have a single nitride bolt and it too showed more visual/surface wear on the bolt face and lugs than do my park'd bolts.
No issues with it yet but it doesn't see the round counts or heat cycles my other bolts do. OP, I think you're fine, but keep an eye on it. |
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Posted: 6/23/2019 11:40:29 AM EDT
[#14]
Quote HistoryQuoted:
'N'/sample size = 1 for me so please take this with the appropriate grain of salt, but I have a single nitride bolt and it too showed more visual/surface wear on the bolt face and lugs than do my park'd bolts. No issues with it yet but it doesn't see the round counts or heat cycles my other bolts do. OP, I think you're fine, but keep an eye on it. |
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Posted: 6/23/2019 12:11:48 PM EDT
[#15]
Depending on which site you read, who made what, and their quality, Chrome can have a Rockwell hardness of 65-70 and QPQ Nitriding can have a Rockwell hardness of 65-70.
I just checked the safe and my wife's Nitride C158 Bolt does not show this 'wear', but she has a BA performance series 16" lightweight barrel with Nitrided barrel extension. |
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Posted: 6/23/2019 12:26:03 PM EDT
[#16]
Quote HistoryQuoted:
Yeah, my Nitrided Toolcraft shows more "wear" than my bcm or psa premium bolts, but I'm not too worried about it...yet. Quote HistoryQuoted:
Quoted:
'N'/sample size = 1 for me so please take this with the appropriate grain of salt, but I have a single nitride bolt and it too showed more visual/surface wear on the bolt face and lugs than do my park'd bolts. No issues with it yet but it doesn't see the round counts or heat cycles my other bolts do. OP, I think you're fine, but keep an eye on it. |
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Posted: 6/23/2019 1:19:00 PM EDT
[#17]
Quote HistoryQuoted:
I dumped all my nitrided bcgs and went back to milspec awhile ago. No issues other than visual wear, but I do not like second guessing shit. Quote HistoryQuoted:
Quoted:
Quoted:
'N'/sample size = 1 for me so please take this with the appropriate grain of salt, but I have a single nitride bolt and it too showed more visual/surface wear on the bolt face and lugs than do my park'd bolts. No issues with it yet but it doesn't see the round counts or heat cycles my other bolts do. OP, I think you're fine, but keep an eye on it. For those asking, it's toolcraft from either RTB or Monmouth/armorally |
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Posted: 6/23/2019 3:49:00 PM EDT
[#18]
That's just paint coming off the carrier and bolt. It's not really important other than to make it pretty to sell. However it may look like considerable wearing but it's really not.
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Posted: 6/23/2019 3:50:36 PM EDT
[#19]
Quote HistoryQuoted:
That's just paint coming off the carrier and bolt. It's not really important other than to make it pretty to sell. However it may look like considerable wearing but it's really not. |
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Posted: 6/23/2019 7:47:55 PM EDT
[#20]
Quote HistoryQuoted:
Likewise. I have maybe 4 nitride bolts and went right back to buying milspec. For those asking, it's toolcraft from either RTB or Monmouth/armorally Quote HistoryQuoted:
Quoted:
Quoted:
Quoted:
'N'/sample size = 1 for me so please take this with the appropriate grain of salt, but I have a single nitride bolt and it too showed more visual/surface wear on the bolt face and lugs than do my park'd bolts. No issues with it yet but it doesn't see the round counts or heat cycles my other bolts do. OP, I think you're fine, but keep an eye on it. For those asking, it's toolcraft from either RTB or Monmouth/armorally I am curious as to the cleaning routine, and if the receiver extension finish is anything other then routine.... just curious if "something" ( ultrasonic cleaning ? , steel wire brush ? ) is accelerating the finish wear. I know it is pretty easy to remove the dark finish on some thing Nitrided. @SDMF_Rebel |
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Posted: 6/23/2019 8:01:24 PM EDT
[#21]
Quote HistoryQuoted:
These... not knocking Nitrided at all and have many it use.. but for some reason Parkerized MilSpec "feels" like a wiser choice ( for many other reasons the shown bolt surface wear ) in my drag it in the dirt / mud/ muck / sand AR's. I am curious as to the cleaning routine, and if the receiver extension finish is anything other then routine.... just curious if "something" ( ultrasonic cleaning ? , steel wire brush ? ) is accelerating the finish wear. I know it is pretty easy to remove the dark finish on some thing Nitrided. @SDMF_Rebel Quote HistoryQuoted:
Quoted:
Quoted:
Quoted:
Quoted:
'N'/sample size = 1 for me so please take this with the appropriate grain of salt, but I have a single nitride bolt and it too showed more visual/surface wear on the bolt face and lugs than do my park'd bolts. No issues with it yet but it doesn't see the round counts or heat cycles my other bolts do. OP, I think you're fine, but keep an eye on it. For those asking, it's toolcraft from either RTB or Monmouth/armorally I am curious as to the cleaning routine, and if the receiver extension finish is anything other then routine.... just curious if "something" ( ultrasonic cleaning ? , steel wire brush ? ) is accelerating the finish wear. I know it is pretty easy to remove the dark finish on some thing Nitrided. @SDMF_Rebel |
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Posted: 6/23/2019 8:04:11 PM EDT
[#22]
The blackened finish is just a result of the process (QPQ/Nitriding/whatever a company calls it). The depth of the case hardening is the benefit.
FWIW, I've had TC, PSA, and AIM bcgs all do the same to various degrees. Eta: OP, your TC has a lifetime warranty so I'd just hammer away with it. 
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Posted: 6/23/2019 10:09:59 PM EDT
[#23]
Quote HistoryQuoted:
That's just paint coming off the carrier and bolt. It's not really important other than to make it pretty to sell. However it may look like considerable wearing but it's really not. 
Think we need to bring back the "read more, post less" line. |
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Posted: 6/23/2019 10:29:37 PM EDT
[#24]
Quote HistoryQuoted:
Think we need to bring back the "read more, post less" line. Quote HistoryQuoted:
Quoted:
That's just paint coming off the carrier and bolt. It's not really important other than to make it pretty to sell. However it may look like considerable wearing but it's really not.
Think we need to bring back the "read more, post less" line.
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Posted: 6/23/2019 10:31:14 PM EDT
[#25]
Quote HistoryQuoted:
Who paints their bcgs? |
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Posted: 6/23/2019 10:39:25 PM EDT
[#26]
Quote HistoryQuoted:
No one. Ever. Quote HistoryQuoted:
Quoted:
Who paints their bcgs?
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Posted: 6/23/2019 10:40:52 PM EDT
[#27]
OP that's just a nice patina. shoot it and enjoy it.
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Posted: 6/23/2019 11:51:15 PM EDT
[#28]
You'd cry if I showed you how my BCG's look....
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Posted: 6/24/2019 2:32:28 AM EDT
[#29]
Quote HistoryQuoted:
Bingo I have other nitride bolts with more rounds on them with less finish worn off. It sounds like I'm viewing nitride incorrectly as a surface finish. Quote HistoryQuoted:
Quoted:
OPs issue is the the black has worn off. Does that mean we’re dealing with bare, untreated metal now? I have other nitride bolts with more rounds on them with less finish worn off. It sounds like I'm viewing nitride incorrectly as a surface finish. |
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Posted: 6/24/2019 7:19:24 AM EDT
[#30]
... What everyone had already stated concerning finish wear vs case hardening being two different things.
Also, some sell nitrided carriers with phosphate bolts. That bolt doesn't appear to be phosphate, but worth mentioning. |
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Posted: 6/24/2019 8:17:45 AM EDT
[#31]
Edit.
It’s probably fine. |
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Posted: 6/24/2019 8:42:46 AM EDT
[#32]
I'll admit that I feel a little better with a name brand milspec bcg in my SHTF rifle, but man the nitride is nice when cleaning after shooting suppressed compare to phosphate.
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Posted: 6/24/2019 8:58:55 AM EDT
[#33]
A good technical article on nitride surface hardening from the NRA. Includes an explanation about why and how the “black” may fade although the nitride hardening is still there. Article quotes one of the owners of H&M Metal Processing, one of the industry leaders.
https://www.shootingillustrated.com/articles/2017/12/30/the-pros-and-cons-of-nitride-barrel-finishes/ |
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Posted: 6/24/2019 8:53:06 PM EDT
[#34]
Looks good to me.
Nitride looks like shit when it starts to wear but it's still hard and corrosion resistant under the black finish. |
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Posted: 6/25/2019 9:38:13 AM EDT
[#35]
At least your lug corners aren't peening off.
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Posted: 6/25/2019 9:47:16 AM EDT
[#36]
Quote HistorySeen that on a couple others that were nitrided. 
@FrankW134 9310 or C158? |
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Posted: 6/25/2019 9:51:49 AM EDT
[#37]
Quote HistoryQuoted:
Seen that on a couple others that were nitrided.
@FrankW134 9310 or C158? Quote HistoryQuoted:
@FrankW134 9310 or C158? |
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Posted: 6/25/2019 10:11:47 AM EDT
[#38]
Quote HistoryQuoted: Not sure, it's out of a seekins factory upper. All they advertise is "melonited m16 bolt carrier group". The 2 that I've seen were 9310, just curious. |
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Posted: 6/25/2019 8:44:15 PM EDT
[#39]
Quote HistoryQuoted:
That's just paint coming off the carrier and bolt. It's not really important other than to make it pretty to sell. However it may look like considerable wearing but it's really not. 
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Posted: 6/26/2019 5:31:19 AM EDT
[#40]
Quote HistoryQuoted:
I'm still waiting to hear about "painted bcgs". |
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Posted: 6/26/2019 5:36:15 AM EDT
[#41]
Quote HistoryQuoted: Thou shalt close the port door before spraying thine AR with Krylon 
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Posted: 6/26/2019 5:39:19 AM EDT
[#42]
Quote HistoryQuoted:
Fun hater. Quote HistoryQuoted:
Quoted: Thou shalt close the port door before spraying thine AR with Krylon
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Posted: 6/26/2019 6:00:05 AM EDT
[#43]
Quote HistoryQuoted:
I'm still waiting to hear about "painted bcgs".
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Posted: 6/26/2019 6:51:41 AM EDT
[#44]
Quote HistoryQuoted: Pretty sure some companies Cerakote their BCGs, probably the closest we’ll get.
(Nasty) |
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Posted: 6/26/2019 9:38:53 AM EDT
[#45]
OP, as others have said, its normal and the benefit of the nitride surface hardening is still there.
But, just to make you feel better, here's a pic of one of my Toolcraft black nitride BCGs that also has ~1500 rounds on it. 
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