Encountered problems today

[six8]

First time I've had issues with any of my builds. The gun in question is my 11.5" SBR with a BCM LW bbl, Vltor upoper and San Tan lower. BCG is BCM. I guess the problem is FTE/Double (?) feed. Spent case wasn't fully ejecting but at the same time the BCG was trying to chamber the next round. Only had the problem when firing rapidly.

Have about 1500 rounds on the setup and could replicate the problem with 3 different mags.

Thoughts?

[six8]

OTOH, my new 300 build ran great!

[Dstrbdmedic167]

Standard gas block or an adjustable? Also what ammo?

[six8]

Standard gas block or an adjustable? Also what ammo?

Standard GB and M193

[Dstrbdmedic167]

And you've run 1500 rounds fine and now you're getting issues?

[six8]

And you've run 1500 rounds fine and now you're getting issues?

Yup! probably closer to 2k rounds and not all M193. I've run silver bear, wolf steel/gold, AR223, you name it. Never an issue

[Thompson]

Not sure how old the BCG is, but maybe the extractor spring is worn? But if it has only seen 1500 rds, that shouldn't be a problem.

Did you try a different BCG yet? Or only different mags?

Is it possible that timing could be an issue, since it's an SBR?

[UWone77]

So you had some failures to eject? Is it possible to swap out the bolt or BCG to narrow down the issues?

[alamo5000]

Have you tried a deep clean of the chamber?

[six8]

Not sure how old the BCG is, but maybe the extractor spring is worn? But if it has only seen 1500 rds, that shouldn't be a problem.

Did you try a different BCG yet? Or only different mags?

Is it possible that timing could be an issue, since it's an SBR?

Didn't think to run my other BCG

So you had some failures to eject? Is it possible to swap out the bolt or BCG to narrow down the issues?

[six8]

Have you tried a deep clean of the chamber?

I clean the gun after every outing. What do you mean by deep clean?

[alamo5000]

I clean the gun after every outing. What do you mean by deep clean?

Nothing in particular. Just seeing if you are getting all the way down in the chamber when you clean.

Can you take a pic of the spent cases that were having a hard time ejecting?

[six8]

Nothing in particular. Just seeing if you are getting all the way down in the chamber when you clean.

Can you take a pic of the spent cases that were having a hard time ejecting?

I'll swab the bbl and clean around the extension with qtips. Didn't take my phone so no picks unfortunately. Last time it happened the brass was wedged pretty good on the upper side of the BCG. Took some force to dislodge it.


Last cleaning was with frog lube (first time using it) and I noticed today after the first mag that I was running it pretty wet. Too wet? Is that possible?

[alamo5000]

I'll swab the bbl and clean around the extension with qtips. Didn't take my phone so no picks unfortunately. Last time it happened the brass was wedged pretty good on the upper side of the BCG. Took some force to dislodge it.


Last cleaning was with frog lube (first time using it) and I noticed today after the first mag that I was running it pretty wet. Too wet? Is that possible?

Did you use the paste or the liquid?

When you have it all apart just get a rag and take apart and wipe down your BCG as well as getting all the way up in the chamber.

[six8]

It's sorta pasty I guess. More like a gel