Brl Sub-assm,16.1" M4 4140cm Sbn,5.56mm

5.56 16" M4 LE 1:9 Car Gas Barrel Extension

Specifications:

- Caliber: 5.56x45mm NATO Chamber
- Barrel: 16" M4 Profile Barrel
- WASP Treated 4140 Chrome-Moly Steel
- 1:9" Twist