Guidamolla Ultimate V2 Madbull AlluminioThe version 2 ball bearing spring guide features a slightly thinner diameter shaft to accommodate springs of all sorts, making it more forgiving for both the spring and piston to compress. The spring guide's shaft is built in with the top bearing plate to allow more rigidity and maximum spring decompression. As a spring decompresses, the bearings allow full twisting, adding improved rounds per second and maximum power.