Just like the rest of their products, YHM manufactures their own rails and handguards from the SLM competition free float handguard to a standard two-piece quad rail. Whether you have the need for M-LOK or KeyMod slots on your handguard, you can find the right one for you. The Black Diamond features a full length picatinny rail and multiple M-LOK slots while the SLR utilizes KeyMod. The SLR also features a slanted design to match the Slant muzzle brake for a unique look.