Fail To Feed/Double Feed? Magazine Problem or Something Else?

[MegademiC]

The upper is a 2A billet, 2A rail, Spikes 11.5, 2a Ti gas block, Radian Raptor charging handle so should not be an issue with the parts. Everything is torqued to spec.
lower is San Tan billet ambi, Stag LPC + POF trigger. Standard carbine spring and buffer. Tailhook mod 2.

Each time using a totally different Bolt and Carrier group.

I got hung up on using just the OKAY 20 rounders so will have to try to use the anti-tilt CProducts 30 rounders next range session.

This is a new build and now that I think more clearly about it, I am a bit more certain it's the 20rounders that have been giving me issues that I was ascribing to the BCG.

The casing is ejected, the next round is jammed tip up and with the bolt denting it about midway.

Does it happen when hand cycling? Slow and fast, or one or the other?
Moving it slowly, the bolt should catch the back of the rim, as shown inyour last pic. At this point, the bolt will push the round into the chamber. Can you post pic of feed ramps?

Try new mag,
Then try h2 buffer with the same 20rd mags, if problem doesnt show when hand cycling.