APS Stubby 5.5" Steel Outer Barrel for M4 / M16 series Airsoft AEG
The actual barrel that extends out of receiver is 4.4". (1 inch of this unit goes into the receiver.)
Thread: 14mm negative / counter-clockwise.
- Ultra compact / as short as it gets barrel for M4.
- For experienced techs / modification might be required for certain brands.