Yankee Hill Machine Co MR7, M-LOK Handguard, Fits AR-15, 15, Anodized Finish, Black YHM-5318 The MR7 is one of YHM's lightest handguards to date" but you can still add accessories along the entire handguard length" even at every 45 degree position. Note: This handguard features a T marked extended top rail.