X-Ranges, and how they affect your accuracy and shooting range
The X-Range design was inspired by the R-hop, with the goal of maximizing contact with BBs when the bucking is depressed. That increases friction to produce topspin as well as air seal inside the barrel to achieve maximum range.
The X-Range is the bell- or cup-shaped with the wider end facing the loading nozzle.
The X-Range is made of silicone material to be especially tough, resistant to wear, and extreme temperatures, which reduce deterioration of the bucking. Even when using GBB, the X-Range keeps the hop-up working at low temperatures.