Ar 15 jamming problems UPDATE! found the problem! ss media users should read this!

[ziconceo]

So, for some reason my 223 ar keeps jamming.

It has been running perfectly for the last year. I changed nothing except a new optic. Now after about 20 rounds it starts to jam every 2-3 rounds.

How does it jam you ask?

The round doesn't fully go into battery. When I try to take the live round out, I notice that its nearly stuck, I have to pull on the charging handle as hard as I can to take it out. (I have visible abs so its pretty darn stuck lol)

The rounds are shiny and clean, the bullets are 55 grains and not near the rifling at all nor are there any marks on the brass that indicate being stuck.

Ive tried 3 different bolts so I know that's not the problem.

I cleaned the chamber thoroughly too...

I r stumped

please help

Found the problem, Un-burnt powder in chamber

[IMG][/IMG]

UPDATE! I found the true problem! It was my brass cleaning process that caused this!!!!

I recently got into stainless steel media. I guess my drying technique wasn't good enough and it left a layer of water around the inside of the brass. when I fired the tainted rounds, the center of the powder ignited, but there was a ring of wet powder around the edges!

[davegonewild]

Check your gas block. I had a similar problem and noticed the gas block had moved 1/8" forward.

[cdtx2001]

Gas problem.

[CandG]

Check your gas block. I had a similar problem and noticed the gas block had moved 1/8" forward.

Yep. I had a similar problem as well, the cause was the same. Probably misaligned gas ports.

It's easy to check without taking the gun apart, although you'll look funny while doing it:

Separate the upper from the lower. MAKE SURE THE CHAMBER IS EMPTY. Plug the chamber with your finger, or something, put your mouth around the muzzle, and blow. Yes, you read that right. Use compressed air if the previous step makes you feel uncofortable for gun saftey and/or homophobic reasons You should feel plenty of air coming out the gas tube in the receiver - if you don't feel much air, or none at all, then your gas port is either misaligned or plugged.

[SkyHawk]

It's easy to check without taking the gun apart, although you'll look funny while doing it:

...put your mouth around the muzzle, and blow. Yes, you read that right.

You forgot the last step - smoke a cig after you're done. Probably should also do something to reaffirm your hetero-manhood like watch a football game or BBQ or somethin

[aleng888]

you got a dirty chamber or a tide spec chamber. Did you change the band or type of ammo that you use ?

[Beelzy]

Maybe the sight is clamped down a tad too much? Remove it and try again.

[CandG]

you got a dirty chamber

In that case, step one changes, but step 2 remains the same:

[Ron-Solo]

I had that happen with one of my rifles. Turns out one of the screws holding the gas key in place was broken. Couldn't get the broken piece of screw out. Had to replace the bolt carrier.

[ziconceo]

Okay I plugged the chamber and blew through the front of the barrel with one of those keyboard cleaner air cans. Air came through fine. It was cold so I took my finger out of the chamber and a bunch of un-burnt powder came out. I believe that is my problem!

It makes sense because there are no marks on the brass.

My load for the ammo is:

55gr fmj
22.5 imr4064

Its kinda odd that this wasn't a problem before.... but I'm not sure what to do about this. Cause now I have to shoot 140 rounds of this jam inducing ammo....

[IMG][/IMG]

[beretta929mm]

Are the 55gr fmj projectiles oversized by a tiny bit?

[ziconceo]

Are the 55gr fmj projectiles oversized by a tiny bit?

No, its the un-burnt powder

[Mickey D]

Also, clean the bolt and carrier of carbon build up. This will help tremendously.

I use this one, works excellent.

http://www.gngtools.com/

[Beelzy]

H335 burns cleaner. FWIW.

[desertrider]

Okay I plugged the chamber and blew through the front of the barrel with one of those keyboard cleaner air cans. Air came through fine. It was cold so I took my finger out of the chamber and a bunch of un-burnt powder came out. I believe that is my problem!

I was gonna suggest a dirty chamber not allowing the lugs to fully engage. Make sure to use a chamber brush during your normal cleaning routine.

Since you used canned air to blow out the barrel, follow it up with a dry patch and an oiled patch down the tube. Don't want condensation to stay in there from that super chilled blast of compressed air.

Glad you found the problem.