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Posted: 11/26/2018 7:40:27 PM EDT
Recently purchased a Colt upper (16” carbine) from a reputable vendor, reading the description on the website it said Colt ar-15 M4 upper similar to a 6920CK. The quality is not quite up to spec with what I’ve seen on other 6920 uppers but it’s not bad either, vendor says this is a Colt built and assembled by Colt from real colt parts for them not something outsourced. Price Seemed about right for what a 6920 UR would be without BCG, CH and Buis. As long as this is gtg I plan on keeping it but if it’s not a quality piece no reason to keep.
Questions: I know Colt has been changing some things and trying to cut some costs so is this a real colt/quality colt UR ? Is this something new for 2018/late 2018? Is this a 6920 UR or different altogether? Any other thoughts you might have… Pics and Additional Info: Arrived in anti-corrosion bag with no box/not in colt marked box Front Sight not F marked, (did they do away with marking new FSP’s or is this just wrong?) M4 mark on front of receiver Receiver and barrel have correct Colt cage code, (believe this will be standard from now on instead of hand stamped C) Barrel is chrome lined Rough spot on lugs near feedramp, (does that look ok? Seems alittle rough to me) Appreciate the feedback, thanks for your time! 
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Posted: 11/26/2018 7:51:32 PM EDT
[#1]
The markings all appear correct for a current production 6920 upper. Appears to be a legit Colt.
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Posted: 11/26/2018 8:03:07 PM EDT
[#2]
Quote HistoryQuoted:
The markings all appear correct for a current production 6920 upper. Appears to be a legit Colt. |
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Posted: 11/26/2018 8:18:38 PM EDT
[#3]
No worries.
CAGE marked receivers are the new flavor, as you stated. Blue mil bag is norm. No more F stamped fsb. Pic is not super clear, but grind/polish marks on the ramps is fairly common from factory. (Although I failed to notice it in any of mine until it was pointed out to me recently here). 
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Posted: 11/26/2018 8:37:40 PM EDT
[#4]
Quote HistoryQuoted:
No worries. CAGE marked receivers are the new flavor, as you stated. Blue mil bag is norm. No more F stamped fsb. Pic is not super clear, but grind/polish marks on the ramps is fairly common from factory. (Although I failed to notice it in any of mine until it was pointed out to me recently here). |
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Posted: 11/26/2018 9:02:54 PM EDT
[#5]
Quote HistoryQuoted: Good to know, I just don't like that the machining around the feedramps aren't even, looks sloppy and they feel rough, would something like this contribute to failure to feed? I doubt that you will have any issues. |
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Posted: 11/27/2018 1:04:49 AM EDT
[#6]
I saw an Expanse upper that looked very similar.
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Posted: 11/27/2018 1:20:14 AM EDT
[#7]
OP, I just traded into a 6920 barrel that also has the top of the feed ramps ground.
I researched it and it is a thing Colt does, I found a few threads on it, including the one where Tig found out about it. From what I've seen it seems to be exclusive to the 6920 and 6920SOCOM. Although it could be a new factory Colt rifle thing now. Anyway don't worry its all legit Colt. @HD2006 this is what I was talking about 
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Posted: 11/27/2018 9:59:36 AM EDT
[#8]
Quote HistoryQuoted:
I saw an Expanse upper that looked very similar. |
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Posted: 11/27/2018 10:25:06 AM EDT
[#9]
Quote HistoryQuoted:
OP, I just traded into a 6920 barrel that also has the top of the feed ramps ground. I researched it and it is a thing Colt does, I found a few threads on it, including the one where Tig found out about it. From what I've seen it seems to be exclusive to the 6920 and 6920SOCOM. Although it could be a new factory Colt rifle thing now. Anyway don't worry its all legit Colt. @HD2006 this is what I was talking about |
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Posted: 11/27/2018 10:26:20 AM EDT
[#10]
Quote HistoryQuoted: don't believe any of the expanse rifles had the M4 barrel profile/cut either. SOCOM profile barrels. Colt Expanse SOCOM Profile Barrel |
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Posted: 11/27/2018 10:39:49 AM EDT
[#11]
Also here are the links I found to other posts about the feedramps in case anyone else is curious about this...
https://www.ar15.com/forums/ar-15/Have_you_ever_seen_Colt_M4_feed_ramps_ground_like_this_/118-628568/ https://www.ar15.com/forums/AR-15/Should-I-be-concerned-M4-barrel-extension-feed-ramps/4-731399/ https://www.ar15.com/forums/ar-15/Colt_AR_15_A4__Pic_s_Inside_/118-637224/? |
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Posted: 11/27/2018 11:00:48 AM EDT
[#12]
Quote HistoryQuoted: They actually did, and the one I saw did. People were actually snagging Expanse rifles that had SOCOM profile barrels. Colt Expanse SOCOM Profile Barrel |
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Posted: 11/27/2018 11:01:05 AM EDT
[#13]
Feed ramps look good to me. Choot it!
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Posted: 11/27/2018 11:06:34 AM EDT
[#14]
Expanse line was a glorified parts dump.
No 2 runs alike. |
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Posted: 11/27/2018 2:12:06 PM EDT
[#15]
As others have already pointed out, the polished feed ramps are normal for Colt. Though sometimes it looks like less of a polish and more of a grinding, as is the case with your example.
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Posted: 11/27/2018 2:30:35 PM EDT
[#16]
Quote HistoryQuoted:
As others have already pointed out, the polished feed ramps are normal for Colt. Though sometimes it looks like less of a polish and more of a grinding, as is the case with your example. I wish they would stop fucking with it, if it ain't broke don't fix it. But Colt gonna Colt. 
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Posted: 11/27/2018 2:35:25 PM EDT
[#17]
Quote HistoryQuoted:
Like the OP's mine is also uneven and looks like shit. Should still work fine tho. I wish they would stop fucking with it, if it ain't broke don't fix it. But Colt gonna Colt. |
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Posted: 11/27/2018 2:45:28 PM EDT
[#18]
Quote HistoryQuoted: Or better yet, set up a jig to do a perfect job every time. Curious as to why it's done to begin with. What criteria deems one extension worthy vs another not? |
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Posted: 11/27/2018 2:52:23 PM EDT
[#19]
Almost impossible to get the right angle for a pic with the barrel installed in a receiver, but if you zoom in you can see how uneven the inverted V in between the feed ramps was ground, and how uneven the outside ends of the feed ramps were ground. Can also see where they cut into the chamber from the left side feed ramp. Right side doesn't show much in this pic but its there too
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Posted: 11/27/2018 3:09:02 PM EDT
[#20]
Now that I flip my phone and zoom in on OP's, his inverted V is even worse. What the fuck are these idiots at Colt even thinking?
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Posted: 11/27/2018 3:25:14 PM EDT
[#21]
Quote HistoryQuoted:
Almost impossible to get the right angle for a pic with the barrel installed in a receiver, but if you zoom in you can see how uneven the inverted V in between the feed ramps was ground, and how uneven the outside ends of the feed ramps were ground. Can also see where they cut into the chamber from the left side feed ramp. Right side doesn't show much in this pic but its there too https://i.imgur.com/zkBWGJS.jpg It's not quite as bad, but still... a little minor profiling was done. I don't really get why they should need to fuck with the extension at all. Did some monkey at Colt just take it upon himself to "improve" random barrels? It shouldn't be necessary... and seems like a really labor-intensive and inefficient way to address it if there is a problem. If your extensions aren't straight, figure out why and fix it... don't profile them by hand, ffs. |
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Posted: 11/27/2018 3:30:33 PM EDT
[#22]
Quote HistoryQuoted:
Damn, that is pretty ugly. I was just about to post something like, "Haha, my new Colt barrel is perfect and yours isn't, nananana!" to fuck with you... but then I figured I'd better double check. Mine has 'em, lol. It's not quite as bad, but still... a little minor profiling was done. I don't really get why they should need to fuck with the extension at all. Did some monkey at Colt just take it upon himself to "improve" random barrels? It shouldn't be necessary... and seems like a really labor-intensive and inefficient way to address it if there is a problem. If your extensions aren't straight, figure out why and fix it... don't profile them by hand, ffs. Quote HistoryQuoted:
Quoted:
Almost impossible to get the right angle for a pic with the barrel installed in a receiver, but if you zoom in you can see how uneven the inverted V in between the feed ramps was ground, and how uneven the outside ends of the feed ramps were ground. Can also see where they cut into the chamber from the left side feed ramp. Right side doesn't show much in this pic but its there too https://i.imgur.com/zkBWGJS.jpg It's not quite as bad, but still... a little minor profiling was done. I don't really get why they should need to fuck with the extension at all. Did some monkey at Colt just take it upon himself to "improve" random barrels? It shouldn't be necessary... and seems like a really labor-intensive and inefficient way to address it if there is a problem. If your extensions aren't straight, figure out why and fix it... don't profile them by hand, ffs. Did you zoom in on OP's feed ramps and look at that inverted V In between them? My God man. You couldn't have possibly done a worse job |
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Posted: 11/27/2018 3:38:32 PM EDT
[#23]
Quote HistoryQuoted:
I get the feeling somebody got a FTF so Colt said "lets take a dremel to all feed ramps! - being most people at current day Colt have no idea what they're doing, and most of the ones that did got fired. Did you zoom in on OP's feed ramps and look at that inverted V In between them? My God man. You couldn't have possibly done a worse job Quote HistoryQuoted:
Quoted:
Quoted:
Almost impossible to get the right angle for a pic with the barrel installed in a receiver, but if you zoom in you can see how uneven the inverted V in between the feed ramps was ground, and how uneven the outside ends of the feed ramps were ground. Can also see where they cut into the chamber from the left side feed ramp. Right side doesn't show much in this pic but its there too https://i.imgur.com/zkBWGJS.jpg It's not quite as bad, but still... a little minor profiling was done. I don't really get why they should need to fuck with the extension at all. Did some monkey at Colt just take it upon himself to "improve" random barrels? It shouldn't be necessary... and seems like a really labor-intensive and inefficient way to address it if there is a problem. If your extensions aren't straight, figure out why and fix it... don't profile them by hand, ffs. Did you zoom in on OP's feed ramps and look at that inverted V In between them? My God man. You couldn't have possibly done a worse job |
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Posted: 11/27/2018 3:48:52 PM EDT
[#24]
Those guys doing the chainsaw log carving hit a low revenue peak.
Colt hired them. 
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Posted: 11/27/2018 3:59:54 PM EDT
[#25]
I'm pretty sure I just found the side business of the Colt Dremel Guy...
 REDNECK DREMEL DENISTRY!! DO NOT TRY THIS AT HOME!! |
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Posted: 11/27/2018 4:34:23 PM EDT
[#26]
Quote HistoryQuoted:
This ^^^ Curious as to why it's done to begin with. What criteria deems one extension worthy vs another not? Quote HistoryQuoted:
Quoted: Or better yet, set up a jig to do a perfect job every time. Curious as to why it's done to begin with. What criteria deems one extension worthy vs another not? |
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Posted: 11/27/2018 4:38:22 PM EDT
[#27]
Quote HistoryQuoted:
Now that I flip my phone and zoom in on OP's, his inverted V is even worse. What the fuck are these idiots at Colt even thinking? |
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Posted: 11/27/2018 4:49:17 PM EDT
[#28]
Quote HistoryQuoted:
That was the first thing that I noticed. Most of the ones that I've seen look like the one in your picture. Quote HistoryQuoted:
Quoted:
Now that I flip my phone and zoom in on OP's, his inverted V is even worse. What the fuck are these idiots at Colt even thinking? I've never had a feeding issue with any of my unmolested Colt chambers and barrel extensions that I recall. That raises the issue of why in the first place. If these extensions feed an M4A1 just fine at 900RPM, why the shit does a 6920 extension need to be messed with? Well I can answer that. It doesn't. You suck Colt.
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Posted: 11/27/2018 5:05:53 PM EDT
[#29]
Quote HistoryQuoted:
His looks like a damn mountain range. I hope there is a stop put to this because who ever is doing it they're obviously not competent. I've never had a feeding issue with any of my unmolested Colt chambers and barrel extensions that I recall. That raises the issue of why in the first place. If these extensions feed an M4A1 just fine at 900RPM, why the shit does a 6920 extension need to be messed with? Well I can answer that. It doesn't. You suck Colt. If they have a really good reason for doing this, they need to do a better job of it. |
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Posted: 11/27/2018 5:26:17 PM EDT
[#30]
Colt all things possible.
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Posted: 11/27/2018 5:32:00 PM EDT
[#31]
I put > this < in Colt's industry section in hopes that someone at Colt still looks in there every once in a while.
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Posted: 11/27/2018 5:48:27 PM EDT
[#32]
Quote HistoryQuoted:
I put > this < in Colt's industry section in hopes that someone at Colt still looks in there every once in a while.
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Posted: 11/27/2018 5:57:25 PM EDT
[#33]
Quote HistoryQuoted:
I enhanced it
If anyone else can get pictures of their Colt feed ramps feel free to post them over there. |
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Posted: 11/27/2018 6:11:42 PM EDT
[#34]
My latest 6921 barrel has it too.
(More polished/less ground). My cell won't fit in there for a quality pic. |
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Posted: 11/27/2018 7:21:16 PM EDT
[#35]
Interesting, Im waiting on a colt upper from Brownells. If it as bad as yours, I'll send it back. I think that is unacceptable.
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Posted: 11/27/2018 7:34:39 PM EDT
[#36]
Quote HistoryQuoted:
Interesting, Im waiting on a colt upper from Brownells. If it as bad as yours, I'll send it back. I think that is unacceptable. |
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Posted: 11/27/2018 10:37:59 PM EDT
[#37]
Quote HistoryQuoted: Or better yet, set up a jig to do a perfect job every time. |
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Posted: 11/27/2018 10:42:18 PM EDT
[#38]
Quote HistoryQuoted:
Almost impossible to get the right angle for a pic with the barrel installed in a receiver, but if you zoom in you can see how uneven the inverted V in between the feed ramps was ground, and how uneven the outside ends of the feed ramps were ground. Can also see where they cut into the chamber from the left side feed ramp. Right side doesn't show much in this pic but its there too https://i.imgur.com/zkBWGJS.jpg |
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Posted: 11/27/2018 10:45:15 PM EDT
[#39]
Quote HistoryQuoted:
I put > this < in Colt's industry section in hopes that someone at Colt still looks in there every once in a while. |
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Posted: 11/27/2018 11:10:56 PM EDT
[#40]
Also big thanks to everyone for the input and info, I love Colt but still not thrilled with this. I really wanted this to be a nice build that will be with me for life, even though it's probably serviceable I can't help but feel like I paid too much for what I got, am I being too picky about this lol?
I'm probably going to ask if the vendor will exchange it and see what I get, like I said originally the price was fair but would you be happy if you paid money and got this? Is this worth Colt $$ in late 2018 with a lot of other nice stuff out there for the same price? |
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Posted: 11/27/2018 11:14:42 PM EDT
[#41]
I'd shoot the hell out of it.
I highly doubt that you will experience any feeding issues honestly. |
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Posted: 11/27/2018 11:31:30 PM EDT
[#42]
Quote HistoryQuoted:
Dang, yours looks rough too, any feeding issues or beyond normal marks on your brass? Quote HistoryQuoted:
Quoted:
Almost impossible to get the right angle for a pic with the barrel installed in a receiver, but if you zoom in you can see how uneven the inverted V in between the feed ramps was ground, and how uneven the outside ends of the feed ramps were ground. Can also see where they cut into the chamber from the left side feed ramp. Right side doesn't show much in this pic but its there too https://i.imgur.com/zkBWGJS.jpg |
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Posted: 11/28/2018 12:32:59 AM EDT
[#43]
Quote HistoryQuoted:
I'd shoot the hell out of it. I highly doubt that you will experience any feeding issues honestly. |
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Posted: 11/28/2018 1:02:21 AM EDT
[#44]
Quote HistoryQuoted:
Haven't gotten a chance to take it out yet, only had it for a few days. But it did have some green tip residue in the chamber so I'm guessing it passed the test fire at Colt. Still not happy about it tho. If it was done right or preferably not done at all id be a happy camper. What they did on ours looks like dogshit. |
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Posted: 11/28/2018 1:38:53 AM EDT
[#45]
Quote HistoryQuoted: Agreed, same here. Will be interesting to see if 556Cliff or any of us get a reply on the Colt industry page. I'm hoping for a miracle though.
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Posted: 11/28/2018 6:58:29 PM EDT
[#46]
Here are two of my Colts. I also had another Mk18 that I bought from a member here who swore it was a legitimate Mk18 upper but I knew from the dremel marks that it was a chopped 6920.
Colt 6921 Upper, dremeled. 
Real Colt 10.3" Mk18 Upper, not a 6920 or 6921 Chop. No dremel marks. 
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Posted: 11/28/2018 8:27:55 PM EDT
[#47]
I’ve got 3 6920 varieties from 5 yrs old to a few weeks old and they all have that feed ramp grinding. I checked my buddy’s 6 different ones from 6 yrs old to early 2018 and they all have it too. Apparently something Colts been doing for awhile and doesn’t seem to hurt anything.
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Posted: 11/28/2018 9:31:24 PM EDT
[#48]
Quote HistoryQuoted:
I’ve got 3 6920 varieties from 5 yrs old to a few weeks old and they all have that feed ramp grinding. I checked my buddy’s 6 different ones from 6 yrs old to early 2018 and they all have it too. Apparently something Colts been doing for awhile and doesn’t seem to hurt anything. |
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Posted: 11/28/2018 9:45:27 PM EDT
[#49]
Quote HistoryQuoted:
Here are two of my Colts. I also had another Mk18 that I bought from a member here who swore it was a legitimate Mk18 upper but I knew from the dremel marks that it was a chopped 6920. Colt 6921 Upper, dremeled. https://i.ibb.co/b6JLG3Y/20181128-175353.jpg Real Colt 10.3" Mk18 Upper, not a 6920 or 6921 Chop. No dremel marks. https://i.ibb.co/4pXfjhk/20181128-175518.jpg |
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Posted: 11/28/2018 10:32:51 PM EDT
[#50]
Quote HistoryQuoted: MK18 looks so nice w/o the dremel marks lol, that 6921 doesn't look bad though, I suppose mine will smooth out over time. |
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