ARP 6.8 18" 3R Mid-weight Spiral Fluted melonited barrel
- Mid length gas system
- 1:10 twist 3R rifling
- Spiral Flutes
- .750 gas block
- M4 feed ramps
- 5/8x24 muzzle thread
- 2lbs 2oz
ARP Superbolt
Aero Precision upper receiver, squared to barrel
M16 Carrier w/ staked gas key