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Posted: 7/31/2015 3:07:47 PM EDT
This is an Anderson upper. Looking at my Palmetto upper, it looks to be smooth throughout.
This one though, the "rough" area is similar to the feel of the outside of the receiver. The smooth area is pretty darn smooth. What say you, black rifle constituents? Is this weird? 
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Posted: 7/31/2015 3:26:35 PM EDT
[#1]
It's def weird
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Posted: 7/31/2015 3:50:10 PM EDT
[#2]
Looks like an uneven application of dry film lubricant.
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Posted: 7/31/2015 3:51:12 PM EDT
[#3]
Yep. Looks unfinished. I had an Anderson upper that machining-wise looked no different than any of my other MIL-SPEC receivers, minus anodizing. (Anodizing was a little off color) but machining wise it was completely smooth and up to par.
The good news is if your carrier still fits in the receiver and slides, then it won't be an issue for you. Assuming the carrier fits, lubricate the snot out of the 4 riding rails on the carrier, and lubricate the inside of the upper, the carrier with smooth out its own path. |
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Posted: 7/31/2015 3:52:40 PM EDT
[#4]
Quote HistoryQuoted:
Looks like an uneven application of dry film lubricant. I don't think it's dry film lube. I think it just wasn't smooth'd out after the initial cut/hollowing minus the chamber end. Half way finished if you will ETA it could be, just looks too uniform to me. Hard to say for sure in black/white |
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Posted: 7/31/2015 4:10:30 PM EDT
[#5]
Was it purchased as a blem?
If so, i betcha that's the blem. 
If not, and it bothers you, i highly doubt Anderson would give you grief over an exchange. |
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Posted: 7/31/2015 4:11:06 PM EDT
[#6]
I thought the black and white would help, here's color.
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Posted: 7/31/2015 4:13:35 PM EDT
[#7]
I don't recall my Palmetto lower being smooth like this. It's really smooth on that one half in the Anderson.
Bolt carrier and charging handle test fit with ease, but gun won't be put together for a few months.. |
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Posted: 7/31/2015 4:20:59 PM EDT
[#8]
Quote HistoryQuoted:
Was it purchased as a blem? If so, i betcha that's the blem.
If not, and it bothers you, i highly doubt Anderson would give you grief over an exchange. Heh, no it was not a blem, or at least wasn't listed as such. Got it from Wise Arms. |
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Posted: 7/31/2015 4:37:47 PM EDT
[#9]
Anderson.........yeah i try and stay away from that.
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Posted: 7/31/2015 4:41:10 PM EDT
[#10]
Without having it in my hands, I'd venture to guess that during the machining process the cutter insert chipped, or got fouled up with chips causing some galling.
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Posted: 7/31/2015 4:43:20 PM EDT
[#11]
Quote HistoryQuoted:
Anderson.........yeah i try and stay away from that. I usually buy gold plated BCM stuff. |
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Posted: 7/31/2015 4:47:01 PM EDT
[#12]
Quote HistoryQuoted:
Without having it in my hands, I'd venture to guess that during the machining process the cutter insert chipped, or got fouled up with chips causing some galling. I think it's really just a half application of dry film lube. I see no galling, but then again, I'm the only one with it in his hands. I'm just not an expert on what's in my hands. :) My Palmetto was not slick like this on the inside that I recall. So heck, maybe this thing is 1.5x better than my Palmetto lower for being half covered in slickness. That's awesome. (trying to remain positive here) |
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Posted: 7/31/2015 4:48:36 PM EDT
[#13]
Thanks for the feedback all!
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Posted: 7/31/2015 6:13:32 PM EDT
[#14]
Weird or not, it doesn't matter. I would say that the upper was mounted on a round spud during sand/bead blasting. That is not galling.
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Posted: 7/31/2015 6:17:33 PM EDT
[#15]
Quote HistoryQuoted:
I think it's really just a half application of dry film lube. I see no galling, but then again, I'm the only one with it in his hands. I'm just not an expert on what's in my hands. :) My Palmetto was not slick like this on the inside that I recall. So heck, maybe this thing is 1.5x better than my Palmetto lower for being half covered in slickness. That's awesome. (trying to remain positive here) Quote HistoryQuoted:
Quoted:
Without having it in my hands, I'd venture to guess that during the machining process the cutter insert chipped, or got fouled up with chips causing some galling. I think it's really just a half application of dry film lube. I see no galling, but then again, I'm the only one with it in his hands. I'm just not an expert on what's in my hands. :) My Palmetto was not slick like this on the inside that I recall. So heck, maybe this thing is 1.5x better than my Palmetto lower for being half covered in slickness. That's awesome. (trying to remain positive here) Dry film lube is not shiny, it is extremely dull in appearance, That looks like an area that was missed in the etching process during pre-treatment. It is not an issue if that is the case. The one thing you might want to check though, to ensure that it is not a machining anomaly, is to check for the step in the ID of the barrel socket, should have a couple thousands of an inch difference between it and the rest of the carrier bore. If you don't see the step, test fit your barrel extension to ensure it is within spec (approximately 0.998"/+0.002" for barrel socket) .. 
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Posted: 7/31/2015 6:40:08 PM EDT
[#16]
The step you're describing is there.
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Posted: 7/31/2015 6:42:26 PM EDT
[#17]
Quote HistoryQuoted:
Weird or not, it doesn't matter. I would say that the upper was mounted on a round spud during sand/bead blasting. That is not galling. I agree. It really doesn't look like a cutter breakdown. |
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Posted: 7/31/2015 6:46:48 PM EDT
[#18]
Quote HistoryQuoted:
The step you're describing is there. That's good news. Then it is only an etching issue during pre-treatment, absolutely nothing to worry about. Now, posts some pics of your build once you complete it.... 
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Posted: 7/31/2015 9:27:00 PM EDT
[#19]
For some reason, the front section was not abrasive blasted before anodizing. Some prefer the tunnel to be blasted before anodizing. I gives lubricants a better surface to adhere to. Some like the smooth machined surface. It will not be a problem at all. Craig
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