Hybrid 6.03mm Precision Inner Barrel 509mm for M16A1/A2/VN/AUG/M249
1st Class Stainless Steel + Aircraft Aluminum Alloy.
Extremely Straight with High Rigidity and Accuracy Guided by an O-Ring to reduce barrel vibration.
Comes with a Modify 2-Ring+ Hop-Up Bucking, Airtight up.