The State-of-the-Art SA-58 Polymer Picantinny Compatable Rail System delivers the best mounting solution for your firearm. Advantages: Enables Four Picatinny Rails for Mounting Picatinny Based Accessories on Your Weapon Secure Attach for your Optical Sights and Lasers State-of-the-Art Ergonomic Design Durable, Hardwearing & Lightweight Construction Quick & Easy Installation No Gunsmith required Provides Appropriate Thermal Insulation Constructed from Reinforced Polymer Composite Specifications Weight 188gr Width 60mm Height 80mm Length 183mm