Is my stock factory?

[Ray Masciarella]

I have a rather standard B4 C grade in pretty good shape. Ordered a letter and it came back as expected, ie w/o ejectors built in 1900. It now has ejectors. I'm pretty sure they were added by the factory cause the stock, which I assume was also replaced since ejectors required at least a different forend, has the serial number stamped in the stock and forend.

The butt stock has a spacer and Hawkins pad. I'm trying to figure out if they were installed by the factory. The pull is short at 13.5". Trying to figure out whether that's factory length too. Installation of pad done very well. Like you would expect for factory job although any good gunsmith could do the same.

The letter doesn't mention the ejectors or new stock. Why? Is there any other place I can go for this info? Is there any way I can tell by examination whether the pad and pull length is factory? Something I could look for?

Thanks, Ray