Today was my first day shooting my AR10 build.
It was not cycling/ejecting the rounds.
I am using
Aero Precision M5 upper Assembly
https://www.aeroprecisionusa.com/m5-18-308-cmv-complete-upper-atlas-r-one
Aero Precision M5 lower
https://www.aeroprecisionusa.com/m5-308-stripped-lower-receiver-anodized-black
Aero Precision LPK
https://www.aeroprecisionusa.com/m5-moe-lower-parts-kit
Nemo Arms BCG
https://nemoarms.com/product/large-frame-recoil-reduction-bolt-carrier-group-and-buffer-kit/