For owners of the Tokyo Marui VSR-10 or compatible clones, the PDI BORE UP Premier Palsonite Cylinder Head Set offers a significant internal upgrade designed for high-end performance. Constructed from durable SUS304 stainless steel with a precise inner diameter tolerance of $\pm 0.01\text{mm}$, this cylinder features a specialized Palsonite finish to drastically reduce friction between the piston and the cylinder walls.

The Bore Up Premier Cylinder Head Set is designed specifically for the PDI VSR-10 BORE UP system. The set includes two main components: the BORE UP Premier Cylinder and the BORE UP Taper Cylinder Head. The Premier Cylinder is constructed from SUS304, featuring an internal diameter of 23mm (larger than normal and PDI Precision cylinders) with a tight tolerance of ±1/100mm, and is processed with laser welding and fixed by parallel pins.