APS M4 CQB-R Convertible Barrel Adapter / Extension Set (Thread: 14mm- Negative)

Aluminum alloy construction Matte black finish Short, medium and long sections allow for customizable barrel length 14mm barrel threads Included Lengths: .75", 1.6", and 3.75" (21mm, 41mm, and 96mm) Compatibility: 14mm threaded barrels Material: Aluminum Alloy