YHM Handguard SLM Carbine Length MLOK Following the successful release of YHM S.L.K. and KR7 KeyMod handguards and in response to customer demand Yankee Hill Machine is proud to introduce our new line of M-LOK rails providing the same lightweight durability with the added versatility of the popular mounting platform. The MR7 is one of our 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.