i dont understand it.... when ya load one in the chamber and fire it, it will eject the casing but will not grap another round, idk if its a problem with the bolt or something in the mag well. any ideas guys?

Sounds like magazine to me, but there's a guy here that knows everything and will be here to tell you I am wrong in a minute...

Does it do it with different magazines?

well i bought a magpul mag today and did it with that one so i put the factory mag in it and it still did it

Like vernon said, probably your mags Get you a Pmag and see if that fixes it. More than likely it will. If you dont like the plastic mags and want to stick with steel you can buy Pmag replacement followers for your steel ones and that will make them feed nearly as good as a Pmag.

k i wasnt sure if it was the mags or not since i used 2 different ones (one ploymer other one steel) if it was something internal. im new to the ar's so im dumb founded when it comes to troubleshooting them

What kind of ammo are you using? Have you tried a different type of ammo? Factory made or handloads?

Randy

I know this sound stupid but are you sure the mag was all the way in and the the mag realease latched ? The reason I ask is, I took a buddy of mine to the range a few months ago and teh same thing kept happening and it took me a minute to notice the mag wasnt all the way in.

It could also be not feeding right if your using real heavy grain military type ammo and dont have M4 feed ramps although Ive only seen this problem in one rifle. What model Colt is it and does it have M4 feed ramps ?

well i just bought it today and the ammo i have shot is pmc fmj brass 55gr and it def has a colt lower the upper idk it is a 20" chrome bull barrel it looks legit but idk im kinda worried

parts gun?

no sir lol i really like the way this gun is set up and shoot i just wish it would shoot more than one round a min lol

Here is some info on feed ramps http://www.m4carbine.net/showthread.php?t=193

If you have an upper WITH feed ramps and a barrel extension WOTHOUT feed ramps that might be your problem. Look and see if you can tell.

im not sure how to tell if it has the m4 feed ramps. and ya i thought the mag wasnt latched and made sure it was in there good and it is a match target colt

DId you check out that link ? They arent the greatest pics but I couldnt find the ones I was looking for that gives a better description. Ill try and see if I can find it.

i dont know if this helps but this is it

Have you checked the serial number range? What does it say on the left side?

it starts with cmh

Heres some pics of the comparison I was talking about, http://www.xdtalk.com/forums/ar-talk/54364-m4-feed-ramps.html

You said the lower was Colt, are you sure the upper is as well ??

no i am not sure the upper is a colt

it dont look like a colt but where would i look to find that out

Never have used PMC ammo, and I don't have an AR myself, so I may be the last person you want to hear from! A friend of mine has several AR's. He has one that for whatever reason refuses to cycle steel ammo, but cyles brass just fine. He has never taken the time to figure out why. We were out shooting the first day he got it. He had a case of steel ammo and it wouldn't cycle them from any of his dozens of magazines. I loaded up one of his mags with my brass ammo and it functioned flawlessly. He called the gunshop he bought it from and was told this wasn't that uncommon with AR's. I dunno' how legitimate that sounds. I would have taken it back. Firearms might function BETTER with certain ammo, but they should at least function with whatever ammo I choose to feed it, within reason.

try loading your mag about 27 vs all 30 and see some govt issues had probs with full mags and if its new it may just be a break in quirk

i tried loading the mags full and then half full then with like 5 in it and it still wouldnt take the next round

I can guarantee you that your upper is NOT a Colt upper based on your photo. If you've established it is not a problem with your mags (I agree to start there first, as 95% of any feed issues I have had were because of a mag issue) then next address your BCG (bolt carrier group). Pull the BCG out of your upper (probably a lower-end Model 1 type if it is unmarked) and ensure that your bolt and extractor slides in and out and oil it if needed. ARs are easy to work on and troubleshoot if you have problems, so don't be discouraged.

this is what it does everytime when i shoot it