6.5 grendel wont go fully into battery.

ghostmoney · Apr 14, 2014

Have a 6.5 grendel AR-15 that the last time I shot it failed to eject a round. Afterwards i noticed that the extractor was broken. I replaced the entire bolt and it would not go into battery. I thought I had messed up and ordered the wrong 6.5 grendel bolt so I ordered the other style grendel bolt, but that one also wont fully go into battery either. Anyone have this experience before?

rick benjamin · Apr 14, 2014

When assembled without a round, does the bolt rotate into the breech?
If it doesn't, ck the bolt carrier key and the gas tube, ensure they mate. Ck for carbon buildup
If it does, load a round, and the bolt won't rotate into the breech, the ammo is at fault.

ghostmoney · Apr 16, 2014

No the bolt does not rotate into the breech without a round. Will pull the bolt and try inserting just the carrier to try and isolate the problem to the bolt carrier key and gas tube. Didn't think that would be an issue as it was fine before the FTE.

snew · Apr 16, 2014

Grendels gave two different depth bolt faces. I bet you have the shallower face and need the deeper one.

ghostmoney · Apr 17, 2014

snew said:
Grendels gave two different depth bolt faces. I bet you have the shallower face and need the deeper one.

That is what I also thought, and ordered the other one. So I currently have both types and neither will work.

ghostmoney · Apr 17, 2014

I took the bolt out and the carrier goes into the upper without any resistance. I also played with inserting only the bolt into the bolt face with both bolts, and they looked to be going in deep enough so I inserted the carrier and with the type II bolt I was able to get it to go completely into battery. This was without the bolt pin and firing pin being inserted though and when I put the bolt back into the carrier I was unable to get it to go into battery again.

ghostmoney · May 5, 2014

JBRC · May 7, 2014

Is this an Alexander Arms rifle?

ghostmoney · May 7, 2014

No this is a custom upper.. I found the problem to be a small nick on the backside of the lugs on the barrel that was preventing the bolt from rotating. Once I shaved it down the bolt went into battery effortlessly.