Not Navy , but I have one from Australia . NSW Goals , prison service in 38/40 !

I had one M14 1/2 in 38/40 also with the saftey like your one , very bad idea for a safty , would even slide it's self on at the wrong time !

Thanks for your photo , I have some bases , but didn't know where they fitted , I'm going to fit them to my 44/40 Carbine one day !

Heres a good goat I shot with a mint 38/40 using 10mm 180gr slugs , they had a big hollow point & blow up !