Ameetec was purchased by another company. The guys who used to run it, no longer do.
One of my ARs is
Cavalry Arms Lower
Sabre Defense Midlength upper
Daniel Defense 9.0 Rail
Ergo Grip handgrip
Magpul CTR buttstock
Smith Enterprises Vortex FH
DPMS lower parts kit
All my other ARs are of similar "frankenness", except my Colt, which is all colt, including the old-skool carbine buttstock.