I am fairly new to air rifles and own an smk xs38. I love tthis rifle. But I want to try a co2 rifle and had my eyes on the new xs501, I spoke to someone from sportsguns.Co.UK who told me he has had o lot of them returned as faulty. Being a new release this could be teething troubles but advised me on the xs78. This is the first time using this forum and I hope to continue using this as I enjoy hunting and air rifles and would like to be able to share my experience with others and also learn from you guys and share some of your knowledge. Any thoughts and advice would be greatly appreciated. K