I just found RifleMags.co.uk

They have some exquisite looking magazines for the Remington 541. They cost an arm and a leg. So, if you can't live without a metal magazine in this series of 22 long rifles here you go. The bodies are of stainless steel except for the base plate that is (well) blued steel that sits flush with the rifle.
As a Canadian, getting guns parts, reloading tools and components, and a lot of other cool stuff across the Canada\US border is well nigh impossible. But much of this stuff can come from the U.K. without much ado.
Cheers