Help Identifying Old Barrel

[badpennny]

I found an old twistlock 8in barrel, and for the life of me I can't recall what it is. I want to say it's a BOA, but I haven't been able to find another one like it to confirm. I'd appreciate any help in identification and potential value, if known.

Here it is and thanks for looking:

http://www.flickr.com/photos/90934529@N06/