New Sport II, failure to extract

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rdbeer

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Just got a new Sport II, but had a failure to extract after only about 50 rounds.

The next round jammed up against it. No way to get it out, needed a cleaning rod to clear the malfunction. Feeling pretty sour about it, have many rifles and never had this serious of a malfunction.

Should I send it back to the factory? Or is this normal for ARs? This is my first AR.
 
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More than likely there is nothing wrong with the AR it is the magazine-every time I have witnessed a double feed such as this it was the magazine lips getting weak.
This is especially true in Magpul and such with the polymer feed lips.
 
Appreciate your reply. It happened with the factory metal magazine (I have the 10 round state compliant one). And it wasn't wasn't a double feed - the fired round did not extract, and then the next round got pushed on top of it.

krunchnik said:
More than likely there is nothing wrong with the AR it is the magazine-every time I have witnessed a double feed such as this it was the magazine lips getting weak.
This is especially true in Magpul and such with the polymer feed lips.
Click to expand...
 
Factory Tula ammo. The stuck case did have part of the rim broken off, but not sure if that happened before or after was trying to clear it out.

BLUEDOT37 said:
Factory ammo or reloads?

An improperly sized case would stick in the chamber.

.
Click to expand...
 
I the rifle properly lubricated? The wetter the better.
Also rifles that dont have true5.56 chambers suffer failure to extract with steel cased ammo.
 
Classic stuck steel case. Is you rifle dry? a dry rifle is a bad rifle. Run a chamber brush, lube the rifle. THE WETTER THE BETTER, as said by Pat Rogers.
 
If you can, remove the bolt and remove the extractor. Is there an O-ring under the extractor and around the extractor spring? That O-ring helps the extractor get a better grip on the rim of stubborn cases in the chamber.

BROWNELLS AR-15 EXTRACTOR SPRING O-RING | Brownells

Also if you have been firing Wolf or other steel cased ammo, make sure you use a regular chamber cleaning brush on a regular basis. While the steel cased stuff works fine in some of my rifles, it is universally dirtier than brass cased ammo and the chambers get dirty quicker, making the cases a little more reluctant to extract.
 
It looked pretty wet... but I re-lubed yesterday to make sure. The barrel on mine is marked 5.56 NATO, hopefully the chamber is sized right, but maybe the cheap Tula ammo is not consistent.

SJC3081 said:
I the rifle properly lubricated? The wetter the better.
Also rifles that dont have true5.56 chambers suffer failure to extract with steel cased ammo.
Click to expand...
 
That "keep it wet thing" is one the internet experts love, because they don't have to really know anything. It doesn't have to be dripping to be properly lubricated. I believe you've already located the real source of your problem:

"...Tula ammo. The stuck case did have part of the rim broken off..." :)
 
A true 5.56 chamber will run cheap Wolf, Tula steel cased ammo perfectly.
In fact Wolf/Tula is a great barometer to judge if you rifle is battle ready.
I suspect you don't have a true 5.56 chamber.
 
Yep, o-ring was there. This was my first 80 rounds out of a new rifle. I'll get a chamber brush - thanks for the advice.
mckenney99 said:
If you can, remove the bolt and remove the extractor. Is there an O-ring under the extractor and around the extractor spring? That O-ring helps the extractor get a better grip on the rim of stubborn cases in the chamber.

BROWNELLS AR-15 EXTRACTOR SPRING O-RING | Brownells

Also if you have been firing Wolf or other steel cased ammo, make sure you use a regular chamber cleaning brush on a regular basis. While the steel cased stuff works fine in some of my rifles, it is universally dirtier than brass cased ammo and the chambers get dirty quicker, making the cases a little more reluctant to extract.
Click to expand...
 
I have this: M&P 15 Sport II | Smith & Wesson
Armornite (hardened nitrite) finish on interior & exterior of barrel. The barrel is stamped 5.56 NATO as I said.

I'm thinking the problem may have been a brittle case rim as Bullet Bob suggested.

Or maybe too much factory lube in the chamber? I didn't swab it out like I should have before shooting.

SJC3081 said:
Do you have chrome lined bore and barrel?
Click to expand...
SJC3081 said:
Don't get distracted. Your problem is not a extractor issue. It is a chamber issue.
Click to expand...
 
That’s an ammunition related issue.

Tula steel cases don’t expand like brass so they don’t obturate (seal) the chamber allowing the blowback from their filthy burning power to gum things up, forcing the extractor to work harder.

Sometimes it so difficult to extract the steel case that a piece of the rim breaks off resulting in exactly the same type of stoppage you’ve experienced.

Keeping your rifle clean and properly lubed will ameliorate the problem.

After firing steel cased ammunition, you’ll need to take extra care in thoroughly cleaning your chamber before firing brass cased ammunition because the brass will expand tightly against the powder residue and jam up your rifle.
 
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