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Posted: 4/9/2016 2:59:30 PM EDT
| I have a FtF problem with my AR. The feed ramps appear to be too steep and it sends every 4th or 5th round up into the top of the chamber instead of seating it. I have a couple questions... Any suggestions on the proper way to fix this? I saw several how to videos on youtube about polishing the feed ramps, but I'm not sure if that would be enough or if I would need to file a little off the top of the feed ramps as well? I'm not sure what tools or attachments I would need to do this. Also, would this be something I could do fairly easily or should I take it to a gunsmith? I appreciate the help. |
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Quoted:
First, step away from the file. 1. What magazines are you using? 2. Have you tried different magazines with the same result? 3. Is the AR brand new? Those are my exact thoughts. I don't think it has anything to do with the feed ramps. Do you have dummy rounds that you can manually cycle to try to re-create the issue? The plastic bullet of dummy rounds can be very telling of where it is getting stuck. |
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Quoted:
I have a FtF problem with my AR. The feed ramps appear to be too steep and it sends every 4th or 5th round up into the top of the chamber instead of seating it. I have a couple questions... Any suggestions on the proper way to fix this? I saw several how to videos on youtube about polishing the feed ramps, but I'm not sure if that would be enough or if I would need to file a little off the top of the feed ramps as well? I'm not sure what tools or attachments I would need to do this. Also, would this be something I could do fairly easily or should I take it to a gunsmith? I appreciate the help. Yes, step away from the files. You have identified a problem but the feed ramps are one of the least likely "solutions." There are several possible causes, including bad magazines or a dirty chamber. Is this a new build? Does it occur with all magazines or just one? Have you thoroughly cleaned the bore with a borebrush and cleaner/lubricant? |
| I have PMags and cheaper metal ones. It does it with both types. I have used a total of about 6 different mags and it does it with all of them. I have also had this issue with several different grains as well. It is a new fairly new rifle and I have had the issue since I purchased it. I would take it back to the shop where I got it, but they have since gone out of business. Also, I have cleaned it several times and tried different types of lubricant. I can't seem to find an answer. |
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Quoted: I have PMags and cheaper metal ones. It does it with both types. I have used a total of about 6 different mags and it does it with all of them. I have also had this issue with several different grains as well. It is a new fairly new rifle and I have had the issue since I purchased it. I would take it back to the shop where I got it, but they have since gone out of business. Also, I have cleaned it several times and tried different types of lubricant. I can't seem to find an answer. Can you post some pictures? |
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The most common reasons are usually faulty magazines, with followers that tilt and feed the rounds at an angle, or a dirty chamber and inadequate lube. Pmags are usually pretty good. If by cheaper metal ones you mean USGI, they are usually good as well. If you haven't already, use a chamber brush and clean the snot out of the chamber. Run it wet.
Short stroking can also cause it if the bolt does not consistently retract far enough between shots to grab the rim of the next round. Check the gas system - for leaks, such as , is the gas block in place and tight, is the gas key on the BCG staked properly and bolts not broken, if you take out the bolt does the carrier slide freely onto and off of the gas tube? Last, does it do it with new US manufactured brass ammo or with steel? Ammo matters, sometimes especially in a new rifle. |
| I'll try to get some pics posted when I get home from work. Also, I'll double check the gas system again. I've run several types of ammo through it and it does it with all different types. I've put about 400 rounds through it and cleaned it between range trips. When it hangs up, I just pull back the charging handle and let it slide forward again and that usually seats it properly. |
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Look at your mag release button. The threaded post should be flush with the button face. If it isn't push it in with a pencil eraser tip until you can screw the mag catch in or out a turn to make it flush. The mag catch may be too tight or too loose causing the mag to sit too high or low when locked in place which will effect the feed angle. |
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People often forget the obvious...contact the manufacturer for factory service. If asked nicely, most will provide a shipping label. If you start grinding, polishing, swapping parts or otherwise altering it, you're likely to loose out on factory support. Too obvious, although I can already guess the OEM's first response, and an even more obvious one: clean it really well and lube it according to the manual, and try again. I would ask one additional question, though. What was the position relationship between the bolt and the cartridge during these jams? Is the cartridge head completely out in front of the bolt (as it should be) or were the front of the lugs positioned somewhere forward of the rim on the case? |
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Quoted:
Too obvious, although I can already guess the OEM's first response, and an even more obvious one: clean it really well and lube it according to the manual, and try again. I would ask one additional question, though. What was the position relationship between the bolt and the cartridge during these jams? Is the cartridge head completely out in front of the bolt (as it should be) or were the front of the lugs positioned somewhere forward of the rim on the case? Quoted:
Quoted:
People often forget the obvious...contact the manufacturer for factory service. If asked nicely, most will provide a shipping label. If you start grinding, polishing, swapping parts or otherwise altering it, you're likely to loose out on factory support. Too obvious, although I can already guess the OEM's first response, and an even more obvious one: clean it really well and lube it according to the manual, and try again. I would ask one additional question, though. What was the position relationship between the bolt and the cartridge during these jams? Is the cartridge head completely out in front of the bolt (as it should be) or were the front of the lugs positioned somewhere forward of the rim on the case? Have you guys considered it was built by the shop that went out of business? |
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Of course that's possible, but the OP only tells us that the shop went out of business, not that they built it. Details would help. Quoted:
Have you guys considered it was built by the shop that went out of business? i believe eric means there is no "manufacture" to send it too,,if the shop that went out of business was the builder. |
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