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Ruger ar 556 malfunction

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9.3K views 40 replies 24 participants last post by  faawrenchbndr  
#1 ·
Bought the Ruger and fired it for the first time yesterday. Firstmag .223 had 3 malfunctions. Easily cleared no problem. Second mag also .223, first round chambered and the bolt locked forward. Had to mortar it to clear the round. After being cleared emptied all 30 rounds with no malfunction.

Tried all three three magpul mags fully loaded. Chambered a round, removed the mag then tried to clear the live round. Bolt stuck in-forward position the charging handle won’t move it at all. Only way to clear the live round is using the mortar technique to unlock the bolt.

All this was done straight out of the box, no cleaning, no extra lube etc. Do you think this may a serious problem or just a break in issue. I’m new to the AR platform so any advice from the experts would be greatly appreciated. Thanks, Bo
 
#2 ·
All the same ammo? If it was all the same ammo I'd try a different brand, preferably 5.56. Get a bronze chamber brush and some solvent and scrub the chamber. Lube it well with some kind of gun oil. Then shoot it. If it still malfunctions after that I would contact Ruger and then let them deal with it on their dime from there. Unless you want a project. A new AR should not give you these problems. I have never had an AR need a break in period to function.
 
#5 ·
Bought the Ruger and fired it for the first time yesterday. Firstmag .223 had 3 malfunctions. Easily cleared no problem. Second mag also .223, first round chambered and the bolt locked forward. Had to mortar it to clear the round. After being cleared emptied all 30 rounds with no malfunction.

Tried all three three magpul mags fully loaded. Chambered a round, removed the mag then tried to clear the live round. Bolt stuck in-forward position the charging handle won’t move it at all. Only way to clear the live round is using the mortar technique to unlock the bolt.

All this was done straight out of the box, no cleaning, no extra lube etc. Do you think this may a serious problem or just a break in issue. I’m new to the AR platform so any advice from the experts would be greatly appreciated. Thanks, Bo
I'd perform a field strip, then check the chamber for any abnormality (like rust, rough machining, etc.). If the chamber looks good then I'd use a generous amount of CLP spray on the bolt/bolt carrier, reassemble it (known as running the rifle "wet"), and fire it for a good 100 rounds or so with some quality brass cased 5.56x45 ammunition (Federal/Lake City XM193, XM855, etc.), which should, barring any mechanical or fitment problems, help the barrel extension/bolt lugs/bolt cam pin/bolt carrier to all break in nicely together. Then field strip it again, clean, and relubricate the rifle sparingly with whichever type lubricants you would normally use.

If the above doesn't remedy the problem then I wouldn't hesitate to give Ruger a call:

1 (336) 949-5200

Best wishes for a simple solution and a happy outcome :D
 
#12 ·
May need to be broken in some. Clean and lube properly.

An example. My old agency purchased brand new Colts. Every single one was a single shot to start. Fire one, break it open, put a rod down the barrel and knock out the casing and repeat. Wasn't until each gun had close to 500 rounds that it would get through a full mag. Colt told us it was normal. This was back in 2001ish time.
 
#17 ·
I just sent a Springfield Saint AR pistol back to Springfield for the exact same issue. Absent some serious gunk in the chamber, a gun that will not allow the user to extract a live round from the chamber using the charging handle and a reasonable amount of pressure is dangerous and unacceptable. In my case, I was using ammo that had been run through a case gauge to ensure that it was within SAAMI spec. I also had used an overall length gauge to be sure that the bullet was not jamming on the lands. It should not make any difference at all whether the bolt is wet or not.
 
#18 ·
Sent it back to Ruger today. Let them deal with it. Let me be clear. Every round chambered could not be ejected using the charging handle no matter how much pressure was used. Had to use the mortar technique to eject the round. Not a cleaning issue that some have mentioned.
 
#19 ·
Weird. Definitely out of spec. I've heard of that happening with steel cased ammo in the Ruger, but not brass. Hopefully, Ruger sorts it out for you quickly.
 
#21 ·
May need to be broken in some. Clean and lube properly.

An example. My old agency purchased brand new Colts. Every single one was a single shot to start. Fire one, break it open, put a rod down the barrel and knock out the casing and repeat. Wasn't until each gun had close to 500 rounds that it would get through a full mag. Colt told us it was normal. This was back in 2001ish time.
They told the same message to soldiers in Vietnam rice paddies carrying those new, space age, Colt M16, then turned into "soldiers, not cleaning enough" and then "must run wet"-- all were design issues and ammo powder miscompatible with specs (turned into a hushed scandal).

I would do a field strip and clean, lube, and if it still is happening, give Ruger a personal call.
 
#22 ·
I have a 6920 that i bought at that same time frame. The machining gouges and other defects that can be seen are amazing. I take it to colt armorer courses to show when they declare colt to be perfect. Every time they try and buy or exchange it from me. It runs decent now. Had to get the chamber de burred and a few other fixes as well. Just fun to tease them with it.
 
#25 · (Edited)
How can you say lube wouldn't correct it from getting stuck? IMO heck yes a new AR needs to be run slathered in oil. Those splines on the bolt and matching recesses in the barrel can "cold weld" together, requiring a mortar jolt to unstick. It's indicative of good, close tolerances. Sure, can also mean it's way off, but as the OP stated, he unboxed and shot it with no prep. Maybe cool for a torture test video, but not a prudent practice IMO. Same reason why I don't drive a brand new car from the dealers lot over to a drag strip
 
#28 ·
No amount of cleaning and lube would resolve OP's issue. Sending it back was the correct decision...
^^^ you have absolutely no way of knowing this ^^^

It appeared to me from the onset that the OP wasn't very knowledgeable of the AR platform because of the vernacular used in the description of events. Completely acceptable and often used methods of overcoming similar isses were recommended in an effort to help resolve the OP's issues, but it didn't appear that all were heeded as there was no mention made of doing so.

There have been many examples of firearms that were sent back to the manufacturer for "problems" that were a direct result of the owner's inability to correctly deduce the problem, or their failure to reassemble the firearm correctly after a field strip.

I'm not saying that this is the case in this instance, but with the advent of recent events causing so many people who never owned a firearm before to suddenly find themselves owning a firearm for the first time or buying into a platform that they've got no prior experience with, I can only envision a greater number of reports of malfunctions and problems being reported that would normally have been resolved quickly and easily had these individuals had some prior form of experience with the particular firearm platform.
 
#31 ·
How are you concluding that the round itself is stuck in the chamber?
 
#30 ·
They may have used the chambering reamer too long before taking it out of service and the chamber is tight, probably mostly towards the neck and throat area. Sometimes you get goo and other crap in the chamber from the manufacturing process and a good scrub with a chamber brush can remove it. If the cleaning did not work when tested with the 5.56 then he did right sending it back to Ruger. Let them deal with it.
 
#32 ·
I don't know why, but I have one Colt AR that is not fond of Magpul magazines especially when fully loaded. My metal GI magazines work flawlessly fully topped off (which I don't usually do and most here probably wouldn't recommend), but stick in a fully loaded magpul, and I'm asking for issues. My particular issue is that it does not want to load the first round off the top of a full mag...It just slides right over the top of it. Now if I download by 3 or 4 rounds it is usually good to go every time. :dunno:
 
#33 ·
A live round does not stick in a chamber within spec because of lack of lube.
Certainly it can when OP didn't take the time to clean and oil the weapon prior to the first firing session. And when he mentioned not a cleaning issue, was this deduced after a good cleaning as he didn't mention it.

Everyone puts out a lemon now and then that's true, whether it is in this case Ruger will find out.