Only works with fm uppers - FM Products Gen 2 Folding Stock Adapter

This looks like a solid piece of kit. Ordered it for my BRN 180 Upper. The first strike against this is it comes with no installation instructions. I had to peruse FM’s Website and YouTube to find them. When I figured that out I realized this was not going to work with the BRN 180 upper. It sticks too far out of the lower to mate with the BRN 180 upper. I emailed FM Products (they don’t list a phone number) about this and they confirmed it is only compatible with their uppers. Would it kill them to mention that in their product description? It would have saved me the headache of figuring this out for myself and having to return it.