Understood. M1 rifles and M1 carbines were sent all over the world, on loan to or sold to the allies of the USA. The numbers you see painted on your stock may be from it's service overseas with a foreign military. Or it may not be a sign of that. It may have served in Egypt. It may not have. I'm not sure how anyone can pin down where a particular M1 carbine or M1 rifle served except by some unusual means, such as somebody recorded a serial number in some document, which was not commonly done.
I suspect that the stamp you see on the barrel reads "Arlington VA", which was the location of an importer called 'Blue Sky', making your carbine (or perhaps just the barrel which was previously on an import carbine) an "Import". Nothing necessarily wrong with that at all, although some people had bad experience with the rifles that Blue Sky imported. The stamp you see is an import mark, because no USGI barrel stamp reads "Arlington VA", or anyplace in Virginia
Bayonets can be found on places like Gunbroker.com. Bear in mind that no WWII carbine had a bayonet lug, although the bayonet lug does impart a potential for more accuracy (as long as the bayo isn't on it!). All bayonet lugs were put on post war; all USGI carbines were built for WWII
To post photos, get a free account at a place like photobucket.com . I recommend photobucket, it seems the easiest service to use
Register at photobucket, and upload photos to your online album at their website. Put the pointer on the thumbnail of the photo, and a list of 'tags' comes up. Then copy and paste the last 'tag' in the list you see under the photo, the one called 'image code'. That last tag is typically the one most websites want to 'see'. There will be no need to type
