Hello everyone, I have been snooping around and even emailed the vendor with no response. Does ANYONE have any idea if the new SSAR-15 bump fire stock is worth the buy and compatible with the H&K MR556A1? Or the LWRC REPR .308? At first I was hoping it would be compatible with ALL AR style weapons. But I figured I should probably know that before I buy it and ask around since the vendor isn't getting back to me in a timely fashion. Thanks!