Forward Controls Design MLOK QD Swivel Sling Mount Black. The M-LOK QD Sling Adapter Heavy (MSQ-H) from Forward Controls Design is precision machined from 4140 chrome moly steel with an incredibly durable salt bath nitride finish to provide exceptional strength and durability. Compatible with your favorite QD sling swivels the MSQ-H updates the existing design from Arson Machine with a stronger material tougher finish and a discreet Cygnus logo. At just 0.867 Oz. the MSQ-H is one heavy duty mount that won't weigh you down. Specifications for Forward Controls Design MLOK QD Swivel Sling Mount: Manufacturer: Forward Controls Design Color: Black Fabric/Material: 4140 Chrome Moly Vanadium Steel Size: One Size Weight: 0.867 oz Finish: Nitride Package Contents: Forward Controls Design MLOK QD Swivel Sling Mount Forward Controls Design MSQ-H: MLOK QD Swivel Sling Mount Black