I either have or have built,

Sendra
PWA
SGW
Oly
Colt (rebuilds)
LRB
Sharps
Aero
Anderson
PSA (new and old)
Eagle
Armalite
RRA
Rock Island (old)
Bushmaster
DPMS

and likely a few others I am forgetting


most all went together without issues,

some early sendra's had minor dimension issues, and a few others here and there would need something minor, but overall no real drama,