A six-pack of Tango Uniform Echo Zulu castle nuts for armorers and builders who assemble several AR-pattern rifles. The castle nut threads onto the buffer tube and holds the receiver end plate in place, locking the tube against the lower receiver. Buying in bulk keeps spares on the bench for builds and repairs.
- Brand: Tango Uniform
- Model: Echo Zulu castle nut
- Quantity: 6 pieces (bulk pack)
- Use: Secures the buffer tube and end plate on AR-pattern lower receivers
