EDIT: I put this in the wrong section. Sorry admin! I need some help with an issue I experienced on the range about a month ago. I'd like to address the fact that I may be putting a lot of a excess info in this post. This is due to the fact that I don't know what caused this issue and am trying to make sure that I can put in as much info as possible that might help answer this problem. You: "Oh my 2Hot, what a lovely rifle you have" Me: "Why thank you! She's not perfect, but I do love her so." You: "Would you mind telling me more about her?" Me: "It would be my pleasure! She is a has a Del-ton Bolt Carrier Group ACE LTD stock Hogue Grip BCM Gunfighter Charging handle Rock River Lower - Trigger Group unknown Brand new PSA 16" Mid-Length 5.56 NATO Nitride 13.5" Lightweight M-lok Upper 1/7" Burris Scope P.E.P.R. Mount with a Redfield 3x9 Battlezone Scope." You: "Everything looks to be in order. What seems to be the problem?" Me: "I used to have a Del-ton 1/9 Bull Barrel Carbine-Length A-2 Upper that worked just fine. However, over Christmas PSA was having a deal on uppers and I decide that I wanted to have an upgrade without an A-2 sight. Not to mention a free-float fore grip for all the goodies I can't afford." You: "I've heard of worse decisions, I'm just not sure when. What happened?" Me: "After receiving my new upper I decided to go out and break in my new upper. My first and last trip to the range with this beauty started with a break in process." IE: 1 round, clean barrel with a swab, brush, swab till clean etc. This process continues for 5 rounds. Next: 5 rounds, clean barrel with a swab, brush, swab till clean etc. (Disclaimer: This is the first time I've attempted a break in process like this for a new rifle. I saw a few articles saying this was something that may improve accuracy & longevity so I figured "what could it hurt?") On round 20-ish I decide its time to try out a group at 100 yards. Round 24 fails to seat properly in the chamber. I flip on the safety and start to inspect the problem. The round is approximately 50% of the way into the chamber. Numerous attempts are used to extract the round using my charging handle. Negligible success is achieved. I brilliantly thing to myself "maybe try the forward assist" shove on her a few times to no avail. In a desperate (and perhaps quite stupid I'll admit) attempt to free my rifle of its confused brass I slide a cleaning rod down the barrel. The cleaning rod freed the round finally allowing me to use the charging handle to clear the round. I seat a new round in the chamber and settle behind the rifle to fire again when a nagging feeling hits me. I should probably check things out to make sure I'm good to go. I separate the upper from the lower and begin my inspection. Lower appears to be clear from obstructions & debris. Take a peak at the upper with a glance down the barrel and what do I see? A piece of something obstructing my barrel. After another run of my cleaning rod down the barrel what do I get? A piece of my own bolt carrier was lodged in my barrel. On the mat next to my rifle was the second piece that broke off of my bolt carrier. I noticed that the two pieces broken off are on either side of the extractor. I'm not sure how much of that has to do with the issue but I took a few photos of the ammunition I was shooting just to be sure. If the photos I took are clear enough you should be able to see some scoring marks on the brass. There doesn't appear to be any bulging of the brass around the neck though. Here are a few more photos of the bolt carrier and the inside of the chamber as best as I could manage. I will be taking the rifle to a gunsmith, I was curious if anyone here could help diagnose what the potential pitfalls were though as well. I greatly appreciate any help that people can offer. If you feel that more pictures may help with you assessment please let me know and I will do my best to take a satisfactory photo. Thanks for your time and I look forward to your help on this issue.