A couple of added points:
The magazine release is right and left hand and the magazines have a magwell for fast reloads.
I am told that the trigger action is slightly uncomfortable, and the pull currently not able to be adjusted and is being reworked.
See the thick hump in front of ejection port?
That’s where the vertically acting lock bridge is located.
The one-way pin below is the retainer rod that passes through kidney shaped cam in the inverted u-shaped lock piece.
The one-way pin is also the breakdown pin.