The Watchtower Firearms Durabolt TTZ is a 5.56 NATO bolt carrier group for AR-15 rifles. It is made from 8620 steel and carries Watchtower's True Black finish. It drops into a standard AR-15 upper as a direct replacement for a mil-spec carrier. It is a straightforward upgrade or spare for a 5.56 AR-15.
- Fits: AR-15
- Model: Durabolt TTZ
- Caliber: 5.56 NATO
- Material: 8620 steel
- Finish: True Black
- Manufacturer part: DB556TBTTZ
