Unhappy customer - Kaw Valley Precision OPMOD Hybrid-K Linear Compensator

The Compensator looks OK. However, I can not install it because it did not come with a crush washer. I expected it to come with the washer. I checked (afterwards) on the web site and it made NO mention of the washer. So, there was no way that I knew I would have to buy the washer as well. In my opinion that is lousy marketing and worse customer service! The rating is for the device not the customer service.