We have a model 340 series E in .222 Remington, with the gun being stainless steel. The serial number is E 431XXX. We have looked in two different gun values resource manuals and cannot find any information about this weapon being stainless steel. The bottom metal and magazine are also both stainless steel along with the sling swivel studs. Has anyone seen this model in stainless steel? Anyone have an idea of the manufacture date?

Thanks for any help!
Herb Grundy