Samson Star 4 Free Floating AR Pistol Rail. This Samson Star Rail is free floated and clamps onto any mil-spec barrel nut. The Samson Star AR Pistol Rail features multiple anti-rotation tabs to secure your rail. The clamp on this Rail from Samson is constructed with an incredibly durable Mil-Spec anodized aluminum and is perfect for your AR pistol. When you want to make a solid connection with your next free float rail make sure you remove your front sight base since the integrated anti rotation tabs of the Samson Star Series Rail do just that. Specifications for Samson Star - 4 AR Pistol Free Floating Rail: Gun Model: AR15 Features of Samson Star - 4 AR Pistol Free Floating Rail: Material: 6061-T6 Aluminum Finish: MIL-A-8625 type III class 2 anodizing ID: 1.34" OD: 2.18" Samson Star 4 Free Floating AR Pistol Rail