FYI, Brownells has a number of customer service options. There is phone support, email support, the ability to post questions and receive answers from Brownells on every product using their Q&A system, even a live chat. The forums are a great resource, but don't forget that Brownells goes to some extent to assist their customers and may likely have more knowledge of their products.
(P.S. were you an actual tunnel rat?) in Nam?