This is a Rival Arms Slide known as the RMR Cut, model RA10G104A.
Created for a variety of models and centered on modern design and compatibility with a wide range of parts and accessories" Rival Arms slides set the tempo for both the look and performance of your pistol.
Features:
CNC Machined
17-4PH Stainless Steel
Recessed Slide Cuts for Compatibility with RMR