Originally Posted By krdt:
First, I'd verify bolt gap is within spec, and change to a 90 or 100 degree locking piece to bring down the rate of fire (standard MKE locking piece is a 115-120 degree).

Otherwise, check that the ejector is properly centered in the bolt channel and freely moving. You can try an HK Gen 3 ejector (I'm assuming you meant ejector); however, the ejector and ejector spring that comes with the ASD lower should be fine.

Originally Posted By raverill:


Sorry should have mentioned in original post.  Bolt gap is 0.35-0.40mm.  I am running a 90 degree POF locking piece.  

I am having a hard time understanding why the gun runs fine in semi no ejection problems, but experiences FTE inject sometimes first round on Super Safe.  The bolt speed should be the same.

Originally Posted By krdt:


If you remove the lower and place the SS in FRT position, do you get any hammer binding (i.e., while holding the hammer and riding it forward as you press the trigger)?

If it's functioning 100% in semi, and you've got a 90-degree LP, it's possible you might be getting some binding, and it's slowing the bolt velocity enough to cause malfunctions. If so, the fix would be to take a small amount of material off the left rear corner of the trigger. A few passes with 400 grit should do it.

Originally Posted By krdt:


If you remove the lower and place the SS in FRT position, do you get any hammer binding (i.e., while holding the hammer and riding it forward as you press the trigger)?

If it's functioning 100% in semi, and you've got a 90-degree LP, it's possible you might be getting some binding, and it's slowing the bolt velocity enough to cause malfunctions. If so, the fix would be to take a small amount of material off the left rear corner of the trigger. A few passes with 400 grit should do it.

Originally Posted By raverill:


Ok that hammer movement is smooth as butter.  Couple things I have noticed.  There is play in the ejection lever, front to back and right to left (this is around the rotation axis).  Here were some wear marks on the ejector.  I did take apart the gun yesterday and put a 9mm round in the bolt and I could simple wiggle the bolt and the round would fall out.  I put a new extractor spring (probably the 7th one I’ve installed) and it’s tight again.  My guess is maybe it’s shoot one full mag clean on SS and then goes back to FT eject/FTF

https://www.ar15.com/media/mediaFiles/421774/IMG_7922_jpeg-3757219.JPG


https://www.ar15.com/media/mediaFiles/421774/IMG_7921_jpeg-3757220.JPGhttps://www.ar15.com/media/mediaFiles/421774/IMG_7920_jpeg-3757221.JPG

Originally Posted By krdt:


Oh, there's your issue, for sure. You're definitely getting contact between the ejector and bolt. Those wear marks shouldn't be there.

I assume that's the ejector included with the ASD lower? If so, I'd contact them and see if they think it's an issue with the ejector retention piece or if the ejector itself is out of spec.

The ejector should be centered in the channel and have little to no side-to-side play. You could probably fix it with a shim washer if ASD doesn't get you squared away, but I'd contact them first.

ETA: If you remove the two torx ejector retaining screws, can you see any play where the (brass if I recall) retaining piece slips into the keyed notch in the lower? Or, is the play happening in the ejector itself (i.e., too narrow, wallowed out from the impacts with the bolt, etc.)? It would help to narrow down where you're getting play, and I'm sure ASD will replace it if their parts are to blame.

Originally Posted By krdt:


Given your update, I would contact AS Designs and see about them either sending you a new T-slot piece or possibly sending back the lower. Mine fits snugly, and there is next to no play in the ejector. It certainly isn't impacting the bolt.