UNICORN Umarex/VFC Glock Hop Up Inner Barrel Set Style:Hop-Up Chamber w/ Inner Barrel (86mm) Compatible with A&K style Box hpa m4 adapter FPS Range 370 400 Style:Blue/White NINJAPK68D

Compatible with A&K style Box MagazinesThread Direction: 14mm NegativeGearbox: Version 2 (specs below)Motor: Long TypeFire Modes: Full-Auto

Autobot Hop-Up Bucking

This G&G ARP 9 magazine extension is the perfect upgrade for quick magazine changes and reloads

Mode Operation Side Switch

Brand: Arcturus x C

UNICORN Umarex VFC Glock Hop Up Inner Barrel Set Style:Hop Up Chamber w Inner Barrel (86mm) Compatible with A&K style Box hpa m4 adapter FPS Range 370 400 Style:Blue White NINJAPK68D Compatible with A&K style Box MagazinesThread Direction: 14mm NegativeGearbox: Version 2 (specs below)Motor: Long TypeFire Modes: Full Auto Autobot Hop Up Bucking