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Posted: 12/23/2012 2:57:48 PM EDT
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I know this gets beating to death but I'm trying to troubleshoot why I'm getting misfeeds with my new colt. I seem to get a misfeed about every 10 to 15 rounds. I have all pmags and have tried about 7 different pmags in all with PMC only ammo. My initial thoughts were the feed ramps. They just kind of look rusty and jagged. Then I thought maybe it was short stroking but I've never had the BCG not remain open after the last round so from what I've read that eliminates that possibility. I also get this same misfeeds during the initial charging of the rifle. Making sure to pull the charging handle back all the way and letting the buffer spring do the rest. Also, I only fill my thirty round clips to 20 rounds as well. I've cleaned, oiled, and then cleaned some more running the rifle at different variations of wetness. It doesn't seem to affect the outcome. The mag catch is set appropriately making sure flush with the mag button. Spring in the mag catch seems just fine. I've inspected the entire BCG and everything seems in place. The bolt does seem a little rough to move back and forth in the BCG so maybe that's possibly the problem. I'd love to get some more experienced opinions on this. Let me know if you need any other pics or angles. Thank you all so much for your time.
http://i1107.photobucket.com/albums/h386/lawlmaker1/Colt%20AR%2015/IMG_0906_zps49b112ee.jpg http://i1107.photobucket.com/albums/h386/lawlmaker1/Colt%20AR%2015/IMG_0910_zpsde7f6268.jpg |
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Here's a couple more pics of the feed ramps the best I could get. Damn it's hard to get a good pic of them.
http://i1107.photobucket.com/albums/h386/lawlmaker1/Colt%20AR%2015/IMG_0915_zpsbe49c8e8.jpg http://i1107.photobucket.com/albums/h386/lawlmaker1/Colt%20AR%2015/IMG_0934_zps9548cae6.jpg |
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Two things that you might want to check.
1. Make sure that the threaded part of the mag catch assembly if flush with the face of the mag release button. If its now, could be that the mags are canting a tad in the mag well, and a problem for the feed. 2. Pull the buffer and spring, and check the end of coil winds on the spring for edge burs that may be scrapping down the inside of the tube. Same for the cross pin on the buffer, since if it's protruding, then will catch on the inside spring coils. If you find either, then break out a file and remove the burs. Before you reinstall the buffer and spring, make sure to give them a light coat of CLP, including the inside of the tube as well. Lastly, the cleaner and lube of choice for most the rifle is CLP, including scrubbing the chamber with a chamber brush with CLP. If you need a source for CLP, then BreakfreeCLP in the large 16oz spray can is around $10 from Wal-mart. As for that most part, its the copper fouling in the bore that CLP will not quickly dissolve, so when it comes to the barrel bore, something like Sweets copper solvent will work a lot faster here. |
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Two things that you might want to check. 1. Make sure that the threaded part of the mag catch assembly if flush with the face of the mag release button. If its now, could be that the mags are canting a tad in the mag well, and a problem for the feed. 2. Pull the buffer and spring, and check the end of coil winds on the spring for edge burs that may be scrapping down the inside of the tube. Same for the cross pin on the buffer, since if it's protruding, then will catch on the inside spring coils. If you find either, then break out a file and remove the burs. Before you reinstall the buffer and spring, make sure to give them a light coat of CLP, including the inside of the tube as well. Lastly, the cleaner and lube of choice for most the rifle is CLP, including scrubbing the chamber with a chamber brush with CLP. If you need a source for CLP, then BreakfreeCLP in the large 16oz spray can is around $10 from Wal-mart. As for that most part, its the copper fouling in the bore that CLP will not quickly dissolve, so when it comes to the barrel bore, something like Sweets copper solvent will work a lot faster here. Here's the threaded part of the mag catch. I noticed It was loose a couple of days ago so I flushed it up then shot 60 rounds through it and it does the same thing. http://i1107.photobucket.com/albums/h386/lawlmaker1/Colt%20AR%2015/IMG_0949_zpsb014d152.jpg As for the buffer spring, I ran my hand around all of the coils and didn't feel the first bur. http://i1107.photobucket.com/albums/h386/lawlmaker1/Colt%20AR%2015/IMG_0950_zpsc4a343cc.jpg Is this what you meant by the buffer spring cross pin? If so, it doesn't seem to be rubbing on anything. http://i1107.photobucket.com/albums/h386/lawlmaker1/Colt%20AR%2015/IMG_0945_zps4e32a1f1.jpg Thank you so much for the input. I'd rather not send this thing back to Colt so if it's something easy I'd like to repair it myself. It's amazing how this problem has helped to familiarize myself with the rifle. |
| The buffer cross pin previously mentioned is in your second to last picture. The last picture is the buffer retaining pin. Look at the soft bumper on the back of the buffer. The small roll pin that holds the "plastic" bumper to the aluminum tube is the buffer cross pin. |
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What part of KY are you in? Just north of Lex. You? South of Lex. in Danville. If you don't get her running right soon. I would be happy to look it over. I have a outdoor range 4 miles from my house to test it on. Let me know. 
Thank you much for the offer! |
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What part of KY are you in? Just north of Lex. You? South of Lex. in Danville. If you don't get her running right soon. I would be happy to look it over. I have a outdoor range 4 miles from my house to test it on. Let me know.
Thank you much for the offer! No problem!
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Just threw 20 rounds in a 30 round pmag and charged the handle. Then I'd remove the clip and eject the round in the chamber and add the round back to the clip. Did this about 10 or 15 times and got one FTF. Did this with two different pmags and got about the same result. However this is what the round looked like afterwards. It was the same round each time. Is this normal?
http://i1107.photobucket.com/albums/h386/lawlmaker1/Colt%20AR%2015/IMG_0953_zps55ce71b3.jpg Maybe the problem is the feed ramps. Anyone know if this is easily fixed with a polish? |
| Your FTF came from loading and ejecting that round so many times. The firing pin smacks the primer not enough to fire but enough times to break up and destroy the priming compound. It's why we say not to do that with duty ammo. They can also go off doing that. |
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Your FTF came from loading and ejecting that round so many times. The firing pin smacks the primer not enough to fire but enough times to break up and destroy the priming compound. It's why we say not to do that with duty ammo. They can also go off doing that. This was actually the first time I'd tried this. I still get FTF without cycling the same round. That is great to know and if it helps I was testing in the middle of a field on our farm and taking all safety precautions. I was just trying to eliminate whether my mags were the problem. Thank you so much for the info and safety tips. They are greatly appreciated. |
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Angle of attack of the bullet tip to the feed ramps look correct (wear marks on the ramps).
Ends of ramps look to be a tad burred, so might have to polish them out (depending). But lets back this one up, and check for full stroking from the beginning. Chamber brush clean the chamber by hand with CLP, then clean the rest of the rifle with CLP as well. including the buffer and spring. Now put a light coat of CLP on the buffer and spring, and install them into the buffer tube. Spray the inside and out of the B/C with CLP., give the B/C a single flick, then insert it that wet into the upper receiver. Now load only a single round into a mag, insert the mag and charge the round, and fire for effect with the empty mag still in the mag well. Did the bolt lock back? If the bolt locked back on the mag catch, do this a few more times. Does the bolt still lock back after say 6 rounds of single charge and fire? If we can weed out problem knowing that the rifle is full stroking, then we single the problem down to the feed ramps that may need to be polished, instead of just letting them self polish out through live fire instead. |
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Is this rifle new from the manufacturer or a used rifle?
1. Rule out ammo and Magazine issues. Use Remington or Federal. 2. Check your gas tube and gas key for slight defects or bending. Try a BCG from a different rifle. I have ran into a similar problem with one of the rifles i service. I tried everything above and also replaced the buffer spring. I could never resolve the issue. I finally replaced the barrel/chamber with a new one. Problem solved. The old barrels chamber was pitted and worn maybe had 15k rounds through it and i am sure the officer who had it shot steel case through it in his spare time. |
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What part of KY are you in? Just north of Lex. You? South of Lex. in Danville. If you don't get her running right soon. I would be happy to look it over. I have a outdoor range 4 miles from my house to test it on. Let me know.
I ended up FINALLY finding a reputable and somewhat local gunsmith that said he'd take a look at it. I have to wait until february though since he's booked til then. I'll let you know what he finds. |
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What part of KY are you in? Just north of Lex. You? South of Lex. in Danville. If you don't get her running right soon. I would be happy to look it over. I have a outdoor range 4 miles from my house to test it on. Let me know.
I ended up FINALLY finding a reputable and somewhat local gunsmith that said he'd take a look at it. I have to wait until february though since he's booked til then. I'll let you know what he finds. OK, Hope you get her working. You can still give me a yell if you need anything. No, you can't have pics of the wife. 
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