The Surgeon 300 series is designed for advancing youth attackman that want all the technology of the big brother 500 series with a little more forgiving feel. The plastic here is slightly softer so kids up to 13 years old have a better feel while cradling and shooting. The 500 series is much stiffer and designed to produce more shot power. The best news for younger players is that this advanced design is available to them at a price that won't break the college fund an offers all the bells and whistles that the big boys use.