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I also have that same issue, but to me it looks like the left feed ramp is a little bit deformed at the edge where it meets the upper receiver. Its not all burred up but it does look like the edge isn't as crisp as the other side. Issue???

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Do not walk the bolt forward via the charging handle!!!!   The bolt needs to load the round under it full spring tension running forward to correctly strip the round out of the mag, then lock the bolt home.


Also, when you cycle a live round by hand, the tip of the bullet will catch the right hand side barrel lugs, and scratch the bullet on extractor.
So on that note, best guess, the scraps are either coming from you trying to walk the bolt forward, or the off the barrel lugs as you are cycling the live round out.


Post a photo of the scraps on the live round, and I can tell you where they are coming from.

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Slight dent on the very end of the tip if from the loadings.

Check to make sure that the mag catch assembly threaded end is flush with the face of the mag release button.
Next, pull the mag's down and CLP clean it (follower, inside of the mag body, and the spring.   While you have the mag apart, check the bottom of the mag feed ramps for burs and if found, use a stone to remove the bottom of feed lip burs.  

When you load the mags (fully loaded mag is when the last/top round can be pressed down at least 3/4 of the way that it almost allowed another round to be loaded), rasp the back of the mag off your hand to make sure that all the round are seated to the back of the mag body.  During normally cycle, the bottom of the carrier dragging back over the top round and the recoil back of the rifle will seat all the rounds to the back of the mag.

As for the long scratch on the side  of the bullet, that is from the end of edges on the barrel feed ramps.  Some 400 wet/dry sandpaper wrapped on a chop stick will work to break the sharp ends of ramp edges to solve that problem.  But need a photo of straight down the inside of the receiver to see the ramps head on to determine if more than just end of ramp polishing is needed.

Also a shit load of brass shavings, so may have some other problem areas as well that need to be resolved.  Get me a photo head on of the barrel feed lips, and I can post a write up to solve it and other problem areas as well (to solve the brass shaving problem).

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Who did this upper/barrel come from?

The barrel looks like it started it's life off as a not M-4 ramped barrel, then someone took a hand grinder to try to M-4 ramp the barrel instead.
If you got this factory new, then send the upper (or entire rifle) back for a full refund.
If you got this from someone her on the EE, then get staff involved, since the seller needs to refund your money (and it needs to go back to them instead).

Bluntly, the barrel extension is toasted (barrel ramps), and the entire barrel needs to be replaced (read would cost more to replace the barrel extesnion on the barrel, then replace the entire barrel instead.

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And the pic does look funky but in person it is normal!

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Well,idk if the ramps on mine was an issue, I didn't seem to get any good usable information from anyone. Although AR15.com has a substantial amount of good usable AR info, I went and shot my AR yesterday for the first time, after putting 120 rounds down range, I did not have one issue,it ran flawlessly. Now for the few people on here that like to take the wind out of peoples sail and basically call somebody's build junk or cheap, go find a hole,crawl inside and use yours to give yourself a lobotomy. I got more help and more possible solutions from "the firing line forum" than I have ever got from this website. People build what they can afford and what they want to do with their rifle is free for them to do. You should just appreciate that we are all on the same team,we enjoy ar's and firearms period.what brand,make,model,color,price of parts don't matter. As long as they build what they want,its reliable, and they have fun doing what they want,why should anyone degrade the person. I'll never come back to this site, some people on here just run their mouth to be seen on a forum, they offer no help and have no compassion for any problems that someone took time to get on here and try to find an answer,solution to his/her problem. Have a nice day and this goes for alot of people on here, not all.