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![SHS Aluminum Self-Stabilizing One-Piece M4 Hop Up Unit SHS Aluminum Self-Stabilizing One-Piece M4 Hop Up Unit](https://cdn11.bigcommerce.com/s-yck5k/images/stencil/500x230/products/10093/72387/shs-aluminum-self-stabilizing-one-piece-m4-hop-up-unit__61848.1613297050.jpg?c=2)
Lonex Airsoft Metal Enhanced One-Piece Hop-Up for M4/M16. Complete with all nylon gears and hop up adjustment arm.