Freedom Gorilla points out 7 things that shooters need to know as they compare the Vortex Defender XL and Holosun 507 Comp... "For competition shooters, both the Holosun 507 Comp and Vortex Defender XL are great choices. Today we’re going to take a deep dive into two options in the realm of red dot sights: the Vortex Defender XL and the Holosun 507 Comp, both engineered to meet the specific demands of competition shooting. Which do you like more?"