M&P 15 sport help not ejecting

[Mike D.]

I purchased an M&P 15 sport in the spring of this year and have put less than 200 rounds through it. It started jamming so I stripped the gun and did a thorough and reassembled the gun. I took it out this past weekend and it jams every time. It will not extract the spent round and tries to put another round into the barrel. Any tips or help would be greatly appreciated. I know I can ship it back to the factory but if there's a simple fix i would rather not ship it back.

Thanks
Mike

 

[chezuki]

Pic of the feed ramps and chamber? Looks like the brass is smacking something on the way in.

 

[gmcttr]

...Looks like the brass is smacking something on the way in.

From the looks of it, "something" would be the locking lugs which is a new one on me, so I got nothing.

 

[chezuki]

From the looks of it, "something" would be the locking lugs which is a new one on me, so I got nothing.

Agreed... Which shouldn't really be possible

 

[KJQ6945]

Agreed... Which shouldn't really be possible

We talked on the phone about this the other night. It sounds to me like it is extracting the spent casing, but not ejecting it before it picks up the next round. It then tries to shove the casing and a live round into the chamber.

 

[Ericpwp]

If that was the case, would it need more gas?

 

[Ericpwp]

How many mags have you tried?

 

[BehindBlueI's]

I suspect you'll save yourself time and aggravation if you just let S&W take care of it from the start.

 

[Ericpwp]

Can you manually cycle it (safely) without the problem?

 

[Woobie]

You mentioned you took it apart and put it back together. Did you take the bolt out of the bcg?

 

[KJQ6945]

Here is a better picture of his bolt.

 

[Mike D.]

I've tried 3 different mags. All mag pul

 

[Mike D.]

And I toke the bolt carrier completely apart.

 

[Ericpwp]

Well, it doesn't look like you assembled the BCG backwards.

 

[frenchiectfd2203]

That's an odd indentation of brass, I've had some half moons from bcg markings, but never something like that.

 

[Woobie]

Well, it doesn't look like you assembled the BCG backwards.

Thats the first thing I thought of when it looked like there was extraction but no ejection.

Is that ejector spring strong? Is it hard to push the ejector pin down into the bolt?

 

[knutty]

Send it back to S&W, they will make it right.

 

[genXer]

Could always try an extractor upgrade kit.. New extractor, stronger spring, o ring. Had an extraction issue once, swapped in one of these upgrade kits and never had another issue. Worth a shot and it was only around 20 bucks.

 

[55fairlane]

I must agree, send it to S&W , you bough it new? they will make I run.....

 

[TacticalFun]

I hadd this problem. I replaced the bcg and it took care of it. Mine failed to go fully into battery also sometimes.