Indeed, The Iron Age Directory 1911 page 390:

http://books.google.com/books?id=chtaAAAAYAAJ&pg=PA354&lpg=PA354&dq=Wiebusch+%26+Hilger,+NY&source=bl&ots=4Bw1MXnfrs&sig=wLXHX8RriHU6qC7vSv-3ZV6GetA&hl=en&sa=X&ei=FEP5U7GQAeHFigLSoIGQBg&ved=0CCAQ6AEwAA#v=snippet&q=gun%20barrel&f=false

It is possible that some may supply large tubes for something like Naval applications as it doesn't denote small arms.

Kind Regards,

Raimey
rse