Mission of GuRK Stock Adapter: We know that your precious rifle, shotgun or other hunting tools are important to you, they deserve the safety, durable and modern looking D-ring kit for sling on your rifle,that good to attach your ar stock that using sling with clip hooks. Choose our sling adapter, not only reflect your noble taste, but your knowledgeable. And this is our new launched product, will upgrade based on our customers using experience. So our dear customer, your kindly suggestion is very important for our development. Thanks. Wish you have a nice shopping here.