RainerArms.com is a firearms, parts and accessories retailer that also manufactures and private labels some of their own products.
I found their site from a banner ad that popped up on a shooting forum where I was researching AR-15 barrels for my competition rifle. I actually abandoned the site at first, but what got me excited and convinced me to do this breakdown was what they call “APEX” and is a customer loyalty program similar to Amazon Prime.