"My second AR" Olympic Arms "M4A2 clone" retro-modded

Muzzle to Buttplate SHOW AND TELL : "My second AR" Olympic Arms Multi Cal 2009 "M4A2 clone" retro-modded.
Undecided on restoring the receiver backplate castle nut arrangement, and staking.
Not mentioned : The bolt-catch-release lever has an extended catch pad. Gas rings have been replaced.
Link to video on the manual : https://www.youtube.com/watch?v=a8BCpLp3BHk

Muzzle to Buttplate, Nose to Tail, Show and Tell.