First off if anybody has seen the thread on arfcom shhhush  LOL.

 

Little knowledge test whats wrong with this carrier?

 

 

Hint?

Obstructed gas key?  I've got one that looks similar and the gas tube won't completely enter the key...about 1/4" short.

Hint?

gun wont cycle

Even without the pic, if the rifle won't cycle then that points to a problem with the gas system. Like Ty said, either the gas key is loose or obstructed in some way. Is that a cotton patch inside there? PM me the thread on arfcom please.

Crappy picture but looks like a popped primer stuck in the Carrier Key.

Looks like a torx head screw inside.

It does look like a popped primer is lodged in the gas key.

That sucks.....

Easy fix with a long sheetrock screw

Crappy picture but looks like a popped primer stuck in the Carrier Key.

 

 

definitely looks like something is in there but how can you tell it is a primer?

was this reloaded ammo?

Ammo QC is at an all time low and folks are buying anything they can that says .223 or 5.56 on the box, regardless of the quality.

 

I oversee close to 45,000 rounds of 5.56/.223 ammo sent downrange per year as an instructor and student. As such, I have seen a lot of popped primers in factory ammo lately and I have seen them work they way into the carrier key. I had a student rifle go down once and pulled 19 primers out of it before I got it back up and running.

 

This photo looks similar to an issue I have see in the past.

Wow, HE, are the crimped primer rounds doing this too?

I am seeing this across the board but I am seeing it less with mil-spec 5.56 and high-quality .223.

 

This is also not a new phenomenon. I have been seeing this issue crop up over the last 3-4 years, but it has gotten significantly worse over the last 18 months.

popped primer from a FC piece of brass in my 25Ar. pockets were loose and it worked its way into the carrier key first time ive ever seen this failure thought it was interesting.

 

The offending primer

 

 

Came out fairly easy small drill bit and 3mm tap popped right out.

The brass had about 8 reloads on it in the process of culling all FC from my brass supply, it will be loaded 3x and tossed now. Some of my R&P and WCC have up to 11 reloads on them.

popped primer from a FC piece of brass in my 25Ar. pockets were loose and it worked its way into the carrier key first time ive ever seen this failure thought it was interesting.

 

The offending primer

 

 

Came out fairly easy small drill bit and 3mm tap popped right out.

The brass had about 8 reloads on it in the process of culling all FC from my brass supply, it will be loaded 3x and tossed now. Some of my R&P and WCC have up to 11 reloads on them.

 

What's are you loading them with? 

that load was a .257" 90gr SBK over 25gr of aa2200, I think was about 2750fps.