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adjustments
Fully Shrouded Barrel
The single regulator design is standard on the M4 and features FX’s new brass piston regulator
Breech block upgrade allows for caliber changes without removing scope
Huben | GK1 Top Picatinny Rail - Universal (CNC Aluminum) UTG adjustmentsThis is a Top Mount Picatinny Rail for the Huben GK1. This accessory will provide flexibility in optics mounting for the GK1 from smaller prisms and scopes to red dot sights! The design is low profile and intended to enhance your GK1's capabilities! Package Includes: Picatinny Rail Attachment Screw DOES NOT include Red Dot Reflex sight Compatibility: This model is compatible with ALL Huben GK1 Air Pistols. Works with our OP3 RED DOTS
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