VULPO CNC Aluminum Alloy Precision Hop Up Chamber For Airsoft M4 M16

Model Number : M4 Hop Up Chamber Brand Name : VULPO Origin : Mainland China Material : CNC Aluminum Alloy Surface : Class II Anodized Hardening VULPO CNC Aluminum Alloy Precision Hop Up Chamber For Airsoft M4 M16 Gearbox Hunting Accessories Product Desciption: Surface: Class II Anodized Hardening Machined from a solid aircraft aluminum block with tight tolerances to provide better accuracy, consistency, and durability Designed for fast feeding BBs and prevent dropping BBs after removing magazine on M4/M16 series AEG Airsoft Rifles Designed with BB Latching System for automatically locking BBs into the Hopup Chamber to prevent dropping BBs after removing the magazine Automatically opened Latch fully for fast shooting after the magazine re-inserted Manually opened Latch to release BBs from Hopup Chamber by hand Dial Knob built-in for precise adjustments Specially re-engineered the Hopup Arms to work with R-hop, Flat-Hop and Standard-Hop precisely and consistently Removable Brass Threaded Slot Pin for adjustment and maintenance Accepts wide range of Air Seal Nozzle #39;s length from 20.50mm to 21.00mm Fully compatible with most aftermarket soft and hard rubber bucking without losing FPS or dropping BBs Equipped with 3 O-rings, 3 Compression Springs on top, at bottom and in center of housing to ensure the hopup unit is exactly centered, straight and air tight at all times Equipped with 2 Vinyl Covers on both sides of hopup housing to prevent dust and view the BBs that left inside the hopup chamber Compatible to any V2 gear boxes with 11mm or 12mm bore Used for AEG version 2 gear box upgrades (M4, M16,...) Instruction Manuals are included Note: There are 5 options, you can