Guns Modify Refine Hop Up Tensioner 9 Parameter in 18pcs Material 60HA ( Use BB 0.2-0.25g ) ( 9 in 1 ) Killflash VFC H&K Quad Rail Picatinny

VFC H&K Quad Rail Picatinny Rail Covers ( Black ) - Fully cover Picatinny rails with the lowest

Very high heat and low cold tolerances structurally sound from 300 degrees F to -50 degrees F

Easy Reservoir Access Rider’s design allows the bladder to be quickly removed and refilled while its carrier stays on the vest

* Compatibility – 1913 standard picatinny rail

The Viper stock integrates features sought by military professionals and firearms enthusiasts around the world

Guns Modify Refine Hop Up Tensioner 9 Parameter in 18pcs Material 60HA ( Use BB 0.2-0.25g ) ( 9 in 1 ) Killflash VFC H&K Quad Rail PicatinnyHole diameter in each type is 1. 5 1. 0 0 mm, provided 3 more difference hardness base on the material hardness.