After 3 weeks of waiting on a freaking sling mount to ship, I finally emailed RRA to cancel my order. But apparently they have some rules that they didn't tell me before i placed the order.

**NOTE: Once submitted, all orders are final, cancellations will result in a 20% cancellation fee. All order cancellations must be done through the website Contact Us Email (choose subject Order Cancellation); or by Email to: info@rockriverarms.com; or by Fax to: 309-792-5781. Changes requested after order submission, including configuration, subs, etc., will result in a reprocessing charge. Shipping TBD: Shipping charges are To Be Determined, and will be applied at the time of shipment. If this is a credit card purchase, charges will appear on your credit card statement from Rock River Arms. All NFA rules apply. Not responsible for typographical errors. All prices, availability and specifications are subject to change without notice.
***

I read up some not so great past experience with RRA on AR15.com threads from a couple years ago. Not sure if they have improved now.
I hope I will get a good reply on Monday, meanwhile does anyone know about canceling order with RRA?