Ergonomic. Non-slip textured. Ventilated upper and lower handguards. One 4 inch Picatinny rail. Two 2 inch Picatinny rails. One 2 inch Picatinny rail with swivel stud. Blank inserts for when rails are not in use. Rails are removable and interchangeable. Count towards US compliance parts. DuPont Extreme Temperature Glass Reinforced polymer. Manufactured in the USA. Fits: Most AK stamped receivers. Will not fit the M-70. (The M-70 has a stamped receiver, but utilizes a different principle of attaching the stock and the gas piston is longer than a standard AK.) Note: sling swivel studs accepts ATI's Sling Swivel (Part # A.5.10.2506) or any standard sling swivel. Warning - Do not over tighten. Stripped holes and broken screw heads are not covered under the warranty.