MPA Side Rail InsertsAluminum PURPOSE: Ergonomic gripping locations Light weight (1. 6 oz each insert) Multiple Flush Cup locations for accessories such as the Sikes Clutch FEATURES: Machined from 6061 Aluminum Black Anodize Hard Coat finish Includes (2) two inserts Each insert has 6 built in flush cup locations (12 total per pair) for each sling and accessory attachment Lightweight at 1. 6 ounces per insert Hardware to attach to side rails included NOTES: MPA Side rails