Forward Controls Design 5.56x45mm NATO Augmented Bolt Catch/Release, Dimpled w/Forward Biased Upper Paddle, Black, ABC/R v4 FB/AA

"Forward Controls Design 5.56x45mm NATO Augmented Bolt Catch/Release, Dimpled w/Forward Biased Upper Paddle, Black, ABC/R v4 FB/AA. Specifically it is designed to address the difficulty with accessing the factory bolt catch's lower paddle with an ambidextrous magazine catch such as Norgon's Ambi-Catch on the receiver. Many of the ambidextrous mag release's lower paddle is on the same vertical plane as the factory bolt catch lower paddle making identification difficult by feel especially with a gloved hand. The ABC/R's chief effort is focused on that single issue. The lower paddle protrudes further and is angled at 10 degrees to give it even more surface area. These measures put the lower paddle and Ambi-Catch's paddle on different vertical planes. That done we worked on the top paddle. While Forward Controls Design doesn't use it ourselves preferring to pull back on the charging handle instead to load and reload we do recognize far more users use it so the ABC/R's top paddle is made larger and given a 5 degree angle at the lower 50percent and 10 degree angle at the upper 50percent cant. The angled paddle makes it easier for the palm or thumb to access. The notch immediately above the ABC/Rs lower paddle isnt there by accident. As you run your finger down the bolt catch towards the lower paddle the notch is meant to provide tactile feedback to indicate the beginning of the lower paddle. It is important be able to differentiate one control surface from another all without diverting one's gaze to it. The butterfly lower paddle's horizontal extension increases the lower paddle's surface area but stops short of reaching the bottom of the bolt catch in order to create a stand off distance between the extension and an ambidextrous magazine catch's lever. It is our opinion and observation that close proximity of two control surfaces is best avoided. The butterfly lower paddle has increased surface area and doesn't interfere with an ambi mag catch's lever. Specifications for Forward Controls Design 5.56x45mm NATO Augmented Bolt Catch/Release: Manufacturer: Forward Controls Design Gun Model: M16 AR-15 Fabric/Material: 8620 Alloy Steel Caliber: 5.56x45mm NATO Color: Black Gun Make: AR Platform Package Contents: Forward Controls Design 5.56x45mm NATO Augmented Bolt Catch/Release What firearm models does the manufacturer say Forward Controls Design 5.56x45mm NATO Augmented Bolt Catch/Release is compatible with? The manufacturer says that Forward Controls Design 5.56x45mm NATO Augmented Bolt Catch/Release is compatible with AR-15 M16Forward Controls Design ABC/R v4 FB/AA: 5.56x45mm NATO Augmented Bolt Catch/Release Dimpled w/Forward Biased Upper Paddle Black"