Pretty easy to trouble shoot, since the mag has to strip the round out of the mag, angle feed it upwards, then the back of the rim has to slip up the lower side of the bolt face as the round is entering the chamber, then case rim into the bolt recess as the extractor is snapping over the rim.

So at 1:09, we see that its the back of round that is come coming all the way up on the bolt to allow it to slip into the bolt recess to allow the round to fully load that is not happening.
[youtube]https://youtu.be/dYOKEH65bP4[/youtube]

So, need a photo of the front of your bolt, the entrance chamber to the barrel chamber of the barrel, and make sure that your ammo is passing a ammo gauge check, that the crimp to the bullet is correct so the case mouth not crimped correctly is not causing the problem.

On bolt face, its the lower section that the round rim has to climb up to get to the recess that we are checking for rough areas, and well as the entrance radius on the extractor that will allow the rim to push it open as it enters the bolt recess.

On chamber, its the back edge of the chamber straight wall section that we want to make sure is softened, and not left as a  sharp edge.

As for feed ramp and mag, round tip is making its way to the chamber, so not problem there, short of the ammo not sized/crimped correctly, and would be causing a case bind as the back end of the rim is trying to climb up the bolt on the feed.

Pretty good does, don't, and clean ups in this thread,
https://www.ar15.com/forums/ar-15/please_help_me_with_a_9mm_chambering_issue_on_a_new_ar_build/66-684105/

Bottom of bolt edge needs to be rounded where it going to strip a round out of the mag, the face of the lower surface above the bur needs to be polished up so the rim of the case can angle glide up it to the bolt recess, clean up the little bur at the glock cut on the entry of the to the bolt recess, as well as the lower edge of the extractor cut in the recess as well.  Again, back of rim has to angle glide up the lower face of the bolt as the round is feeding into the chamber, and slip into the recess of the bolt face without anything to cause the rim to stick.


On the extractor, do not touch the bottom grabbing claw lower edge, but polish/round the top rounded entry area of the extractor where  the case rim is going to push it outwards to allow the rim of the round to push it outwards so the rim can slip in place under the extractor. Also, round the top and bottom edged side down the radus entry of the extractor as well.  
Again, case has to angle up the lower face of the bolt as it enters the chamber, then before it can slip into the recess of the bolt, case rim has to push the extractor outwards, so the rim and snap under the extractor.   In the second photo, we can see where the rim of the case has been jamming against the extractor to cause a slight hiccup, instead of the case rim pushing the extractor open to allow the rim of the case to get under the extractor isntead.



Chamber looks pretty good, short of it looking like it needs a good cleaning, and the upper receiver bearings areas not being lubed with CLP.

__________________________________________________________________________
Myself, would pull the barrel  chuck it up in a lathe to every so slightly polish the taper to actual chamber straight wall edge to make it ever so smoother to help in feeding problems after giving the barrel a good cleaning.  
Also, would chuck the bolt in the lathe, to polish the  entry taper step to the bolt recess and side walls of the recess as well.

Again, lower lug surface is rough as hell, amd the lower edge bur that is not helping the cause.  
So bottom edge of the bolt lower tab needs to be rounded so there is not at sharp edge as the case makes its angle climb up the bolt lower tap once it free from the mag lips, the surface of the lower tab polished smooth so the rim is still not binding as it's angle coming up that surface, then the polish the  bolt's recess taper entry, and even side walls to smooth them out so the case rim can make a slick transition into the bolt face recess.


This will solve the problem of the case not being able to angle glide up the lower tab and into the bolt face recess, and some outer entry and side rounding/polishing of the extractor outer top surface, would allow the case rim to push the extractor over a hell of lot easier over/outward for the rim to get past the extractor to lock into the bolt face.

To softer edge on the barrel chamfer to barrel chamber edge, just allow the case to entry the chamber easy during the angle transition as the rim comes up the bolt face, and them straightens out to get the last way into the chamber straight.

223 type extractor, but you can see the bottom tap edge rounded, the lower tap surface more the cleaner surface side, and the entery tapers to the bolt recessed a hell of lot cleaner as well. And the reason that I tend to like the 223 extractors, more surface area of the taper entry on it for the case rim to be able to push the extractor outwards once the case enters the bolt face chamfer isntead.

No worries, and post photo's of the bolt when you get it back after it has been polished/corrected.