Completed this last week after what seemed like a very long 2 months.
Posted this on a couple of other sites, thought I'd share.
I need to change the M4 stock out to a Sopmod or Emod and put it back on the Defender lower.
Switch out the harsh RRA lpk trigger with a Geissele SSA.
Get a Bius, sling and mounts.
Components:
Mega Gator stripped lower
RRA lpk
BCM milspec stock assembly w/ carbine buffer
LMT M4 stock
Mega stripped upper w/ M4 ramps
Saber 18" 410SS fluted midlength midweight SPR 1:8 5.56 NATO
G&R Tactical M-16 BCG
DD lo-pro gas block
DD M49.0 free float rail
PWS FSC556
LaRue LT104 mount
Millett DMS-1 1-4 scope



Took it out and it ran smoothly, no issues. Did a 75 yd zero, nice groups for a first time out w/ 55gr VShoc. Gotta load up some 77gr MatchKings to get a better idea.