This is an OEM replacement KRYTAC Bevel Gear Assembly to be used with KRYTAC products.
Umbrella Armory SPR RECCE (2024) - Airsoftzone
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KRYTAC OEM Parts
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VFC HK417 AEG technical review
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KRYTAC - Bevel Gear Assembly for V2/3 AEG Gearbox
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THE 99 UPGRADE KIT – Umbrella Armory .EU
Airsoft Spare Parts E&C 8mm Complete M4 M16 Series AEG V2 Gearbox Version 2 Front Line, Rifles - Canada