Malfunction

[ERNO]

Hey everyone, it has been a while since I posted last but recently ran into a problem with my AR.

I was shooting and as I pulled the trigger three rounds fired at once (like a three round burst) except that my rifle does not have that option. I then took the rifle home and gave it an immaculate cleaning. A couple weeks later I took it back on the range to see if it would function normal and the problem happened twice in about 400 rounds.

Can somone suggest possible problems and who can look at it for a good price? Where do people buy parts for their rifles at good prices as well?

I am in the Denver/Aurora area.

Thanks for all the help in advance.

FOR 22 rimfire AR-15 :It could be a dirty extractor,take extractor holding pin out with your firing pin ;carefully remove extractor,watch out for spring or springs & clean.Extractor could be so dirty it is stuck in the closed position;when it hits the rim of a 22lr,it SLAM-FIRES two or three rounds,cleans itself out;then maybe 50 rds later,it happens again.

[KevDen2005]

Thanks for all the help guys. I will clarify a little more. I thought could be ammo so I did try a few different brands of ammo both in .223 and 5.56. I also put the weapon through an intense cleaning and thoroughly checked the firing pin and the extractor. I didn't see any trash, brass shavings, and there wasn't too much build up of carbon. I did clean them both and checked them. I also don't believe it to be an accidental bump fire because I usually shoot as accurately as possible (I hate to waste ammo in this economy) so with each trigger pull I hold the trigger to the rear after it has been fired for approximately one second. I thought it could have been a bump fire originally when I did a double tap but I have gotten the problem to occur at both a double tap and a single steady shot.

After the weapon had been cleaned and before shooting it again I put it through a functions check approximately a dozen times. It functioned properly each time. Then while shooting it malfunctioned.

I fairly familiar with AR 15's, however I am not an armorer (I wish I was). I am not entirely sure what the disconnecter is or know how to see if it is being timed properly.

[Irving]

What kind of groups are you getting?

[ERNO]

Could be that your roll pins are not aligned correctly in your reciever causing uneven wear on the disconnector.

[BPTactical]

The disconnector is the mechanism that catches the hammer when the trigger is depressed so the hammer does not "follow" the bolt carrier. It looks sort of like a "birds head" when viewed from the side and it fits down into the trigger proper and is retained by the trigger pin. It is spring loaded to catch the hammer(there is a thought-check the spring for proper tension or better yet, just replace it) If that spring is weak/damaged it may cause erratic function of the disconnector that a bench function check may not reveal. The G forces and inertia while firing may be enough to overcome the spring, resulting in "hammer follow" which could result in your tripling.
A piece of trash or such in the trigger/disconnector could also cause it to not engage properly.
Disconnectors have to be "timed" to operate properly. It is a "cut and try" process that can take some time to do properly and unless you are very familiar with the operation and relationship to the hammer you are best off not monkeying with it.
I sent you a PM - let me know and we can get together on it.

[Circuits]

doubling (or in your case, tripling) is almost exclusively a disconnector problem. Replace the disco, or file down the foot to increase its overlap with hammer.

to test:
with the rifle unloaded, hold back the trigger and cycle the charging handle.

VERY SLOWLY let off the trigger... if the hammer drops instead of falling to the trigger sear (you'll hear it if it happens), then the problem is the disconnector.

[Ryan_Th3_K1d]

so uh...doesn't sound like a problem, just make it so it empties the magazine instead of just 3 and then sell it at a gun show...using the gun show loop hole

[Dr_Fwd]

what trigger group you have there? is it a standard or aftermarket?

[KevDen2005]

To sum up a couple of questions:

I have a standard trigger group that came with the rifle.

The rifle is approximately 4 years old.

My shot groups are still tight.


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Furthermore I would point out that now that this gun does that I should ship it to Mexico since they are getting all the firearms from the US...Right?

And I really wish it wasn't a "problem" but I am still going to get it fixed.