TROY Quick Attach Picatinny Rail Section, Fits Certain TROY Rail Systems including TRX 308, TROY HK, TRX Extreme, Alpha and Delta Rails, and T 22 Sport Chassis, M7 Uppers and M7 Kit, Delta Rails, Secures with 2 screws, 3.2 , Black Finish SRAI TRX P3BT 00