Metal fragments in bolt

[Squad51]

I found these little metal pieces inside my bolt today (right side of picture). Any idea what they could be?

Also, the spring/bumper came off the extractor. I can put it back in but it seems looser than in other rifles.

Aero M5
6.5 Creedmoor
Rise Armament bolt/carrier
Criterion bbl.

 

[roostercogburn98]

New? Any rounds fired on it? What kind of ammo if so?

 

[37L1]

What's your firing pin look like?

Pierce any primers?

 

[bfoosh006]

Those are from fully pierced primers.

 

[Tokay444]

Blanked primers.

 

[Squad51]

I haven't noticed any pierced primers, but I haven't been inspecting every round. I'm running factory ammo - Win 125 FMJ. Velocity is averaging 2840 out of a 22" bbl.
Firing pin looks ok. I have about 100 rounds through it and it shoots great - sub MOA.

 

[cas6969]

Yep, that's that. "AR" primers exist for a few reasons.

 

[BuildingConceptsllc]

Yeah, that's definitely what it is and they can really jamb things up too.

 

[Haney]

Check your trigger to make sure none have made it there .

 

[JerkyFreak]

Make sure firing pin tip is round not flat.

 

[Rocketvapor]

Maybe a better picture of the bolt and lugs all cleaned up.

 

[MarshallDodge]

Make sure the chamber is clean and dry before you shoot it. I have been told that gun oils and cleaners left in the chamber, can raise pressures.

 

[LawnMM]

AR10s need an entrance exam. I'd be willing to bet you need a stiffer buffer spring at a minimum.

Is this a light weight carrier? Please say no?

 

[tomme boy]

you also have a clocked barrel extension. the front of your lugs are running into the lugs on the barrel. someone over torqued the barrel nut

 

[Squad51]

Here's a picture of the bolt face.

It is not a light weight carrier. I have a heavy buffer and the timing seems to be good. Ejecting at 3:00 and no ejector swipes.

@tomme - what are you noticing that indicates clocked barrel extension? And how does one fix that? I know the barrel was properly torqued when installed.

 

[Lange Carabine]

@tomme - what are you noticing that indicates clocked barrel extension? And how does one fix that? I know the barrel was properly torqued when installed.

View attachment 8468096

This, I reckon

 

[sloporsche]

return it to the....builder [ guy who screwed it together]

 

[JerkyFreak]

A photo of the firing pin tip would also be appreciated

 

[Squad51]

Here's a picture of the firing pin and the barrel extension. It doesn't look clocked to me.

.

 

[bfoosh006]

FWIW, your photo shows a RISE Armament BCG... not a Rainer Arms one.

It is possible the over pressure ammo helped produce the bolt lug battering.

I wouldn't use that specific ammo anymore.

I had some Fed. 120gr OTM that fully pierced primers as well ( early production lot )

And "Blanked primers" is the more appropriate term. Thank you Tokay444

Do you have the means to measure your FP tip size, and the bolt face FP hole ( aperture ) ?

Sorry if I didn't notice, has this only happened with the Winc. 125gr ?

Any pics of fired cases ? Specifically the Blanked primer ones ?

 

[misser]

have been down that road , there is a fix ,

JPEB-308HP