Problem with my Group Buy Bolt - stuck ejector

[HuntTXhogs]

I’ve got 125 rounds on this bolt and tonight during a hunt the rifle experienced a number of failures I.e. jams

At the end of the hunt after having tried multiple magazines I inspected the bolt and identified the source of the problem.

Jammed / Stuck ejector , fully below the bolt face

[ATTACH=CONFIG]11683[/ATTACH]

I’ll tear it apart tomorrow and see what the story is.....

I’ve never had this malfunction in an aR15 before

[Sticks]

My money is on there is a flake of brass that got wedged in there.

You shooting factory or handloads?

[grayfox]

I was just going to say that, too, after looking at the pic. I've had that, shaving/s get sucked down into the ejector shaft. If that does turn out to be the case, possible ejector round-off of the end may be in order.

[bj139]

Spray some lube in there to free it up.

[HuntTXhogs]

30 rounds of factory the rest handloads

I’d beveled the ejector previously and touched it up even more this time

The ejector was hard stuck - I didn’t have to relieve pressure to drift the pin out. A couple of whacks with handle of a screwdriver free’d it

I’m replaced the ejector spring since it was in a hard bind and oiled and reinstall.

and I’ll monitor ......

[ATTACH=CONFIG]11685[/ATTACH]

[Lastrites]

Feel an burr's on the ejector shaft or see a small chunk of brass fly out?

[Sticks]

If you had already polished the edges of the extractor, your hand loads may be a little on the hot side. Might want to take a closer look for ejector swipes on your last rounds fired.

[HuntTXhogs]

My brass looks fine - running 120 grain bullets at 2446 FPS so not concerned that their hot loads

I noticed some build up on the front beveled edge of the relieved area of the ejector where the cross pin lives.

I didn’t feel as though it was enough substance to lock and hold the ejector in but like belly button lint I cleaned it out and went about my day....

[12Bravo]

That seems like a lot of brass being removed from the case, especially for the relatively small number of rounds that have been fired.

[HuntTXhogs]

All 150 rounds were suppressed so while velocity wasn’t “hot” perhaps the additional bolt thrust from the back pressure is causing some brass smear...

I have a lightweight BCG and standard carbine buffer running, if the ejector ever sticks again I’ll maybe throw in a standard BCG and see if results vary

But

I’m hoping for no more issues

[LRRPF52]

See how much brass shaving residue has accumulated around one edge of your ejector channel rim?

On looking closer at your other picture, it appears that there is a raised surface around the ejector channel edge on the bolt face.

Those sharp edges are shearing a lot of brass of the case heads, and that shaved brass is being driven down into the ejector channel with each cycling of the action when cycling ammo.

I would carefully take that edge off of the ejector channel and polish the bolt face.

This is a common trick on custom guns for High Power, in addition to extractor tuning, ejector radiating and polishing, lapping the lugs into the extension, etc.