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Thread: Failure to feed on a new build.

  1. #11
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    the little bit that i ground out of the receiver should have no consequence. it aint like the aluminum is butter soft under there. i get so tired of folks acting like that .001" of anodize gives all the strength to that aluminum under it. like it's a diamond shield or something. the upped aint made from 1100 series. 7075 is hard stuff. if you polish your feed ramps which should be a good thing yo get rid of the anodize just the same. the most wear it might see is the side off the bullet as it passes over it.

  2. #12
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    In reality had you assembled the upper properly (rifle barrel with rifle upper or carbine barrel with carbine upper) you shouldn't have had an issue. IMO I either build it right or I don't do it. I would never Dremel feed ramps in if they weren't there. JM2CW.

    Quote Originally Posted by nemohunter View Post
    the little bit that i ground out of the receiver should have no consequence. it aint like the aluminum is butter soft under there. i get so tired of folks acting like that .001" of anodize gives all the strength to that aluminum under it. like it's a diamond shield or something. the upped aint made from 1100 series. 7075 is hard stuff. if you polish your feed ramps which should be a good thing yo get rid of the anodize just the same. the most wear it might see is the side off the bullet as it passes over it.



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  3. #13
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    Quote Originally Posted by nemohunter View Post
    the little bit that i ground out of the receiver should have no consequence. it aint like the aluminum is butter soft under there. i get so tired of folks acting like that .001" of anodize gives all the strength to that aluminum under it. like it's a diamond shield or something. the upped aint made from 1100 series. 7075 is hard stuff. if you polish your feed ramps which should be a good thing yo get rid of the anodize just the same. the most wear it might see is the side off the bullet as it passes over it.
    There is no reason to polish the feed ramps on an AR. There is no reason to dremel feed ramps on an AR and yes you weaken the metal.

  4. #14
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    i DID assemble it correctly rifle type ramps in a rifle reciever. nothing M4 about any of it. if YOUR rifle was hanging a cartridge on the feed ramp itself what would you do? the solution since magazine fed weapons have been made is to polish the feed ramps. i probly did not need to grind in M4 ramps but i figured what the heck i'm here. i will loose no sleep over it. i'm sure the weapon wont fail because of it. sorry if it bothers you so much.
    Last edited by nemohunter; 04-15-09 at 07:24.

  5. #15
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    I guess I misunderstood your original post. Does it bother me? Not really. What bothers me are people with limited to to no understanding of the AR platform who build "frankenguns" with questionable parts and then come here asking why their weapon won't work or why xxxx is happening.

    It all goes back to buy crappy or questionable stuff you will get the same results. On a side note, you should have suspected it was a weapon issue especially if the mags WERE KNOWN to function in other weapons without problems.

    Quote Originally Posted by nemohunter View Post
    i DID assemble it correctly rifle type ramps in a rifle reciever. nothing M4 about any of it. if YOUR rifle was hanging a cartridge on the feed ramp itself what would you do? the solution since magazine fed weapons have been made is to polish the feed ramps. i probly did not need to grind in M4 ramps but i figured what the heck i'm here. i will loose no sleep over it. i'm sure the weapon wont fail because of it. sorry if it bothers you so much.
    Last edited by Iraqgunz; 04-15-09 at 07:53.



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  6. #16
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    Quote Originally Posted by nemohunter View Post
    i DID assemble it correctly rifle type ramps in a rifle reciever. nothing M4 about any of it. if YOUR rifle was hanging a cartridge on the feed ramp itself what would you do? the solution since magazine fed weapons have been made is to polish the feed ramps. i probly did not need to grind in M4 ramps but i figured what the heck i'm here. i will loose no sleep over it. i'm sure the weapon wont fail because of it. sorry if it bothers you so much.
    Im not bothered however you came to this forum wanting help and in part of that you posted waht you did and as this is a facts based board with more knowledge in one place your going to hear what you did right or wrong. Again if you want to polich your feedramps fine but this is not a 1911 and the need is not there.

  7. #17
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    I'll bet the true issue lies with the lower. I believe with the rounds hanging up on the feed ramps and having to dremel in M4 ramps just to get it to cycle correctly the mag catch was molded (cut or however Cav arms does it) slightly too low not allowing the magazine to be inserted far enough to allow correct feeding geometry. I would just be careful shooting ammunition that's doesn't have the case securely crimped to the bullet as you may get some bullet set back creating an overpressured round and possible kB. But hey if your rifle works next time you take it out that's awesome but just be careful and wear eye protection.

  8. #18
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    thanks for help guys. it may still have issues. i have said i have only hand cycled it. when i go shoot it again it may still hang up. i dont know. i have a couple of older uppers where the bullets have worn through the anodize without issues. heck the mags are anodize and they wear too. i know they wear out but not for a LONG time.

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