The StormWerkz Ar-180B Stock Adapter Type 5
Installation Instructions on factory Armalite lowers
1. Remove buttplate and using a long 1/4″ hex wrench, remove factory stock.
2. Cut plug off close to rear of receiver, leave about a 1/16- 1/8 material.
3. Sand or file remainder of plug flush to receiver.
4. Bolt adapter to receiver (new bolt included).