GBL AUG Black Widow Metal Hop Unit Plus GBB Inner Barrel Pack
● Material: CNC metal made, with inner barrel 6.03 stainless steel made (Maple-Leaf brand).
● Shooting range: 80M (test with 0.4g bb)
● Three sizes of inner barrel: 14", 310mm / 16", 410mm / 20", 510mm
● Compatible with GBB inner barrel, user needs to modify a little bit by using AEG barrel.
(The original GHK inner tube is AEG specification)