new to m-1's

[USGI]

The last National Ordnance (see edit below) that I looked at did have the '03 barrel - pretty slick job of machining and fitting to the gas piston housing. It also had a welded receiver which could be a problem. I think I see signs of welding or repairs on yours, too. Maybe check them out real good before shooting. - Bob

3/15/12 - I believe the carbine I saw with the '03 barrel was actually a Federal Ordnance - pretty sure the receiver was welded up. I don't believe it was a casting, but may have been - possibly one they "saved" by welding a flaw. A local gun shop has a National Ordnance carbine on the rack now, and it doesn't appear to have an '03 barrel. I believe it was made mid to late 60's after reading the article that IMR linked to in the previous post. - Bob