The GSI hop-up arm for VFC UMAREX MP7A1 AEG made of aluminum offers better durability than the original part.
Used with GSI Hop Up Tensioner
 
The original products are made for improved BB bullet accuracy and range, composed of GSI Flat Hop-Up Cushion.
The GSI hop-up arm for VFC UMAREX MP7A1 AEG, is a stable hop-up that provides a consistent bullet trajectory.  
A must-have for VFC UMAREX MP7A1 AEG users.
This product is one of the difficult ones to install and is highly recommended for advanced users.
 
• EAN & SKU :8809899600603, SKU:  IE21-VMP7HA
• Product Dimension & Weight: 16.43(L)x10.26(W)x3.55(H) mm
• Package Weight & Dimension:  3.3(L)x 3.8(W) x 1(H) inch 1 oz 
• Made in Korea