I've owned ....
Adams Arms
ArmaLite
BCM
Bushmaster
Colt
Daniel Defense
DPMS
Eagle Arms
Essential Arms
LMT
LWRC
Palmetto State Armory
POF
Rock River Arms
SGW
Smith & Wesson
Springfield Armory
The only guns I'd consider for self defense are BCM, Daniel Defense and LMT. A lot of people place LWRC at the same level as Daniel Defense. I've owned 13 LWRC (9 of which were their top of the line) so you can say I really tried to like them, but I wouldn't take one for free if you offered it. They simply don't work with a wide range of ammo quality in varying weather conditions. NOTE: all of my LWRC were piston models. RUN AWAY from piston ARs.