Forward Controls Design Low Drag Forward Assist Black. The LDFA design is partially based on natural selection and mutation. As the AR and its manual of arms evolve so should its controls. The oft-neglected FA evolved into the LDFA by becoming smaller and rimless to accommodate ambi charging handles. There has been ongoing discussions regarding the relevance of the forward assist. Like it and use it or not it is found on standard AR upper receivers. We don't want the forward assist to go away we'd rather have it and not need it than the other way around. LDFA does not have a rim on the plunger and is smaller than a standard forward assist. More importantly on an AR15 or M16 equipped with an ambidextrous charging handle when the user pulls on the right latch to load or reload the weapon the rimless design allows for fluid rearward movement of his hand and charging handle without snagging on his fingernail or knuckle. The smaller footprint of the plunger face does not impact its usability. Specifications for Forward Controls Design Low Drag Forward Assist: Manufacturer: Forward Controls Design Color: Black Fabric/Material: 4130 Steel Gun Model: M16 AR-15 Finish: Nitride Gun Make: AR Platform Package Contents: Forward Controls Design Low Drag Forward Assist What firearm models does the manufacturer say Forward Controls Design Low Drag Forward Assist is compatible with? The manufacturer says that Forward Controls Design Low Drag Forward Assist is compatible with AR-15 M16Forward Controls Design LDFA: Low Drag Forward Assist Black