Therealkoop Posted April 8, 2014 Share Posted April 8, 2014 Won this rifle recently. Tried shooting for the first time today and ran into some issues. It appears as though the cartridge is being inserted into the chamber at an incorrect angle. Each piece of brass is being shaved quite a bit and it looks like its casuing enough friction to stop the bolt. If I lock the bolt back and drop it on a magazine using the release, it will bind 100% of the time. Sometimes the rifle will fire and cycle, but each piece of brass is shaved regardless if it binds the bolt or not. Anyone ever see something like this before? Ive built all my AR's up to this point and have never really had issues. Link to comment Share on other sites More sharing options...
jon49erfan Posted April 8, 2014 Share Posted April 8, 2014 The best part about a factory rifle is being able to send it back to the factory. Link to comment Share on other sites More sharing options...
Steve RA Posted April 8, 2014 Share Posted April 8, 2014 What is the orientation of the scrape on the cartridge while it is still in the rifle ??? Link to comment Share on other sites More sharing options...
MarkCO Posted April 8, 2014 Share Posted April 8, 2014 Hate to have to say it, but that is the third DD like that I have seen in the past few weeks. In one case, it went back to DD and they said it was fine, but it still was not. Link to comment Share on other sites More sharing options...
Therealkoop Posted April 8, 2014 Author Share Posted April 8, 2014 What is the orientation of the scrape on the cartridge while it is still in the rifle ??? Actually I didnt pay attention. When I get home late tonight Ill find out. Link to comment Share on other sites More sharing options...
Dan Sierpina Posted April 9, 2014 Share Posted April 9, 2014 It looks like the chamber was cut, and the sharp edge is still intact, therefore scraping the brass. Link to comment Share on other sites More sharing options...
fastshooter03 Posted April 9, 2014 Share Posted April 9, 2014 Does the chamber have the lead-in angle on it with a slight radius? Nick Link to comment Share on other sites More sharing options...
openclassterror Posted April 9, 2014 Share Posted April 9, 2014 My thoughts exactly. There should be a 30 degree cone cut at the chamber mouth, with about a 1/32 radius breaking the edge between chamber and cone. If the barrel extension was the cause, the scrape would be much narrower, and usually in two places with a gap between. My guess would be that the scrape is on the bottom of the case as it feeds in. Try feeding out of the magazine in slow motion, easing the charging handle forward with the muzzle elevated and see if it still binds up, and where it catches if it does. Tom Link to comment Share on other sites More sharing options...
BitchinCamaro Posted April 9, 2014 Share Posted April 9, 2014 (edited) Is the brass rubbing off anywhere on the extension or feedramps? Apologies if that's obvious, I was just wondering if you had checked. Edited April 9, 2014 by BitchinCamaro Link to comment Share on other sites More sharing options...
Therealkoop Posted April 9, 2014 Author Share Posted April 9, 2014 (edited) Okay ive made some progress. if you are looking into the chamber from the rear of the rifle, it looks like the brass is catching on the left and right sides. I replicated the issue, and got a decent picture. It looks like the case head is occasionally unable to lock into the bolt for whatever reasons, and its causing it to be inserted into the chamber on an angle. One of the first pictures I posted shows this somewhat, but these next pictures show much more. High ejector? Tight extractor? Edited April 9, 2014 by Therealkoop Link to comment Share on other sites More sharing options...
BitchinCamaro Posted April 9, 2014 Share Posted April 9, 2014 Hit the bolt face parts with a thin lube like WD40 and work it in. See if there is any improvement with feeding. If not, just pull it apart to see if anything is gummed up or binding physically and relube with a proper oil. Link to comment Share on other sites More sharing options...
Therealkoop Posted April 9, 2014 Author Share Posted April 9, 2014 (edited) Hit the bolt face- Applying copious amounts of hammer now. EDIT: Removed the bolt and disassembled. I removed the O-ring from the extractor and I was able to cycle 20 rounds by dropping the bolt without issue. About half of them still have a light abrasion on one side, the other half are good to go. Im guessing at this point it depends on what side of the mag the round is stripped from. Edited April 9, 2014 by Therealkoop Link to comment Share on other sites More sharing options...
Nickoli Posted April 9, 2014 Share Posted April 9, 2014 For kicks and giggles, slap one of your other BCGs in it and see how it cycles. I'm surprised they didn't test fire this thing before the match, have you tried to contact them yet? Link to comment Share on other sites More sharing options...
Therealkoop Posted April 9, 2014 Author Share Posted April 9, 2014 Yeah next time I go out im going to drop the BCM carrier in it. It looks like it was test fired, but probably only once. I sent an email but I hardly ever get email responses from anyone lol. Link to comment Share on other sites More sharing options...
BitchinCamaro Posted April 9, 2014 Share Posted April 9, 2014 Hit the bolt face- Applying copious amounts of hammer now. . That's plan B! I was going to suggest the parts swap next. If the other BCG works, try swapping out just the bolt next, then just extractors if you can. I still have a feeling the feedramp(s) may still be playing a role. Link to comment Share on other sites More sharing options...
fishsticks Posted April 9, 2014 Share Posted April 9, 2014 Check the barrel extension and upper receiver - do one or both have M4 feed ramps? Link to comment Share on other sites More sharing options...
Therealkoop Posted April 9, 2014 Author Share Posted April 9, 2014 Yup, they both have the feedramps and they match well. Link to comment Share on other sites More sharing options...
Steve RA Posted April 9, 2014 Share Posted April 9, 2014 Check how the rim fits under the extractor. Link to comment Share on other sites More sharing options...
Therealkoop Posted April 10, 2014 Author Share Posted April 10, 2014 Okay I ran 140 rounds through it today and I couldn't get it to malfunction. My brass is also good now and doesn't show any signs of odd marks or wear. I ended up taking .008 off the total length of the ejector button. It looked a little bit longer than every other bolt I have. It was flush with the face of the lugs, the others were slightly recessed. I also removed the 0-ring from the extractor. I might put it back in now and see if it functions. I think the ejector was one of the largest factors and its length was preventing the case head from indexing in the bolt correctly. Link to comment Share on other sites More sharing options...
BradfromND Posted April 10, 2014 Share Posted April 10, 2014 I had the same problem with a bolt gun a while back. Stiller uses PTG parts and got a bad run of ejectors. They were all a little long. Maybe DD outsources parts and got a bad batch. Link to comment Share on other sites More sharing options...
BBJones Posted April 11, 2014 Share Posted April 11, 2014 I had the same problem with a bolt gun a while back. Stiller uses PTG parts and got a bad run of ejectors. They were all a little long. Maybe DD outsources parts and got a bad batch. DD does not outsource much. Interesting you mention a PTG bolt. I think I had the same problem in my "custom" Rem700 build. Took alot of fiddling to get ejection and extraction to work correctly. When was the bad run of bolts? Mine was about 18 months ago. Link to comment Share on other sites More sharing options...
BradfromND Posted April 11, 2014 Share Posted April 11, 2014 I had the same problem with a bolt gun a while back. Stiller uses PTG parts and got a bad run of ejectors. They were all a little long. Maybe DD outsources parts and got a bad batch.DD does not outsource much.Interesting you mention a PTG bolt. I think I had the same problem in my "custom" Rem700 build. Took alot of fiddling to get ejection and extraction to work correctly. When was the bad run of bolts? Mine was about 18 months ago. My Stiller action was from 3 years ago. Wouldn't feed at all out of the mag. I called stiller and they told me to look at the ejector and see if it protruded past the bolt face.....it did. They took my address and had a replacement in the mail the next day. I kept the other one and could shorten it up to use it in a bind. Link to comment Share on other sites More sharing options...
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