BeeKay Posted March 5 Report Share Posted March 5 I'm building an upper - This is only my second My first build was pretty simple, and I had no problems That was around 2019 - It was luck I just got some parts and put them together, and it didn't give me any problems, Shortly afterward, I wanted to try a different upper, and I wasn't as lucky the second time. I didn't bother to troubleshoot it until now, because I have one that works, so why bother ? Anyhow it's time to troubleshoot that, because I'm not as fortunate on this upper build. I have feed hangups and when I look at the lugs on the barrel extension, I see copper shavings there. In addition to the copper shavings, there are scratches in the bullets as a result of feeding. For starters - I'll ask if there's a You Tube channel that can be recommended ? I started watching Sons of Liberty Gun Works Because he appears to specialize in AR builds. But I'm open to further suggestions, since YT doesn't like to show very much when it comes to gunsmithing. I can show some pics of the scratch pattern on the copper jackets of the bullets, If that would be helpful. OIr if someone has some explanation that's better than a video, I'm open for that. Thank you very much in advance ..... Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 6 Report Share Posted March 6 How many total round through the gun? Quote Link to comment Share on other sites More sharing options...
BeeKay Posted March 6 Author Report Share Posted March 6 (edited) 15 hours ago, 98Z5V said: How many total round through the gun? I am using a bolt and a barrel that are leftover parts from an earlier build It's a KAK .308 Barrel and Bolt Which I am now putting onto a BCA Sidecharging Upper But the Bolt / Barrel combo has about 150 rounds through it The rest of the combo - Including the BCG and Upper & Accessories have never been fired. Thanks for your help Edited March 6 by BeeKay Quote Link to comment Share on other sites More sharing options...
BeeKay Posted March 6 Author Report Share Posted March 6 15 hours ago, 98Z5V said: How many total round through the gun? I think there may be some burrs or sharp edges on the lugs of the barrel extension, As well as the feed ramps showing a slight bit of overhang where it shouldn't be . The edge of the barrel extension feed ramps is about .005" proud of the ramp edge on the housing. Quote Link to comment Share on other sites More sharing options...
BeeKay Posted March 6 Author Report Share Posted March 6 17 hours ago, 98Z5V said: How many total round through the gun? This video shows the issue He isn't permitted to show the actual process, because of YT guidelines. Also I get some chips from a burr or sharp edge on the lugs of the extension scratching the jacket on the bullets when I feed them. It seems like possibly there'd be a general deburring process that I can do to solve that problem as well. Ideas welcome - Thanks Quote Link to comment Share on other sites More sharing options...
shooterrex Posted March 7 Report Share Posted March 7 Take some pics and post them. Quote Link to comment Share on other sites More sharing options...
BeeKay Posted March 7 Author Report Share Posted March 7 10 hours ago, shooterrex said: Take some pics and post them. OK Prolly Saturday afternoon Ever watch SOTAR - That's the channel in the video I posted He gets into some things that I wasn't familiar with, but makes sense Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 8 Report Share Posted March 8 On 3/5/2026 at 9:12 PM, 98Z5V said: How many total round through the gun? @BeeKay, let's go back to this, too. How many total rounds have been fired through this gun that's having this issue? Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 8 Report Share Posted March 8 On 3/6/2026 at 12:20 PM, BeeKay said: But the Bolt / Barrel combo has about 150 rounds through it Okay, I found it ^^^ At 150 rounds, you're still breaking that gun in. Keep shooting it, don't worry about marks on the brass on a brand new barrel, and let us know what it's doing at about 300 rounds - alot of the stuff you're seeing now, is going to stop happening as you break that gun in. Quote Link to comment Share on other sites More sharing options...
BeeKay Posted March 10 Author Report Share Posted March 10 (edited) On 3/7/2026 at 4:11 PM, 98Z5V said: Okay, I found it ^^^ At 150 rounds, you're still breaking that gun in. Keep shooting it, don't worry about marks on the brass on a brand new barrel, and let us know what it's doing at about 300 rounds - alot of the stuff you're seeing now, is going to stop happening as you break that gun in. It looks like the copper shavings are the result of an unfired round being ejected and the copper of the jacket being dragged over the lugs with the pressure of the ejector pushing it as it moves back. Not a problem Thanks, I'll be back if there's anything else Edited March 10 by BeeKay Quote Link to comment Share on other sites More sharing options...
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