The Forward Controls Design A5 castle nut in Flat Dark Earth secures the buffer tube and end plate on an A5-length buffer system. It threads onto the receiver extension and locks it in place against the lower receiver. The FDE finish lets it match a tan or two-tone rifle build.
- Brand: Forward Controls Design
- Type: Castle nut
- Fits: A5 receiver extension / buffer tube
- Color: Flat Dark Earth (FDE)
