Hi everyone, I am brand new to the airgun world. I just ordered my first airgun: an hw50. I want to put a vortek spring kit in it to make sure the gun lasts a long time and shoots as good as it can. Airguns of arizona only lists the pro guide 2 kit, while the vortek website lists the pro guide 4 kit. Which kit do i want? its a .22 rifle and i want to maintain the 11-13 fpe if possible. thank you