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Posted: 12/21/2013 7:25:52 PM EDT
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I changed out my upper because mine I didn't have a dust cover or forward assist and I wanted one. I've never had a single jam issue with my original upper. I install the new one and at the range I had major feed issues. Every second round (usually) wouldn't feed at all/ get jammed up. After I checked it out, I came to the conclusion it is the feed ramps on the new upper. Can you let me know if these look like they would be the reason for this problem, it's the only thing I could think could cause this problem since it is the only thing I've changed. (Sorry pictures are not the best)
http://i782.photobucket.com/albums/yy101/jacedaniel/d41179acb6b6e79740a7a7092ff56c3f_zps8b2adc85.jpg http://i782.photobucket.com/albums/yy101/jacedaniel/b5eb086fa3f0938e2201d2c09e61c41c_zps151543f5.jpg |
| No, I should have done that first. I just have the new one on now. (but if it's between getting rid of the upper completely ) I will take the barrel back off real quick and put the new one on for a quick pic if that will help. I still have it broke down on my table. |
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You don't need feedramps on the upper for the gun to feed properly. There are millions of M16s and AR15s without feedramps that feed perfectly fine. Neither the A2 20" barrel gun or A2 16" barrel carbine that I shoot have M4 feedramps, nor did the rifle that I had befpore, and I have never had a feeding problem from the lack of feedramps.
Did you buy all of the parts for a complete new upper and assemble them yourself, or did you reuse your existing barrel? If you resued your existing barrel, does the attached barrel extension have M4 feedramps cut into it? Usually you don;t see M4 feedramps cut into the barrel extensions of guns that do no have the upper receiver also cut with M4 feedramps. If you reused the old barrel, and it does not have M4 feedramps, but the new upper receiver does, that could be the whole problem, right there. |
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Quoted:
If you reused the old barrel, and it does not have M4 feedramps, but the new upper receiver does, that could be the whole problem, right there. IMO it's no different than a rifle/rifle configuration. If the bullet tip hit's below the rifle ramp it doesn't matter if the receiver has M4 cuts or not, it's going to FTF. OP's upper appears to have very small ramps in it. If he has an M4 ramp barrel and his gun fed the bullet tips into the upper ramps previously instead of into the ramps on the barrel extension, that may be the problem, but it shouldn't be feeding like that anyways. OP's post is lacking info to better diagnose, pics of barrel (installed or not) would help. Perhaps the gas block was not properly aligned when it went back together. |
| I changed the upper back to the original and went to try it out. It did the same thing my first couple of times. Fired the first round, but would not feed any after that. Adjusted my gas block and everything ran fine. Do you think my gas block could have anything to do with this instead of the feed ramps? I'm thinking I may have had the gas to low on the other upper and it wouldn't cycle a round because of that and not the feed ramp? But I didn't know if not enough gas could cause a round not to feed instead of the ramp? Thanks for any advice I can get. |
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