These manufacturers are authourozed to sell Horus reticles:
If your chosen reticle is not available from that manufacturer please contact them and request it.
Burris Company, Inc.
Bushnell
EOTech
Hensoldt
Kahles
Leupold
Minox
Newcon Optik
Nightforce Optics
Schmidt & Bender
SigSauer
Steiner eOptics
SWFA Outdoors
Tangent Theta
Trijicon
U.S. Optics
Vortex Optics
Zero Compromise
Zero Tech Optics