It is compatible with Haley strategic and other fast clip accessories as seen attached to my HS flat pack plus in the second photo. The HS flat pack is not for sale unless we work out a good deal; however it is still pretty new and very lightly used so don’t expect much off the original price if you want to buy it as well. Split Shipping Through HopUp + 10% fee PayPal + 4% fee Feel free to ask any questions you may have