Would really appreciate the experts amongst you if you can help please. I have a 390, great fitted gun, use it in my area, and once a year I travel for a weeks shooting to the UK. A Silver Lark 304 has become available in my gunshop and I beleive the trigger attachment and loading bolt are interchangable with the 390. It would be great for peace of mind to take them with me as spares when I am away. Could anyone please confirm if this is possible please? Big Thanks in advance.