Missing instructions - AIM Sports Inc Remington 870 Keymod Modular Rail System

Excited to get the product except missing instructions. No big deal right? Went to YouTube and nothing. Attempt to contact the company and nothing. Never responded to either of my emails and of course you could not speak to a live person. Checked the website and nothing. And Aim even claims to instructions available on the website and nothing. Maybe should have figure it out but did not want to screw something up. However when I Opticplanet.com they responded immediately. They’re customer service is excellent.