The man in front of you can be injured because the barrel does not extend far enough away from his face. Ask members of your unit for advice and then double check that information. If you find something that isn't' correct, please let me know. Since the implementation of the Brady Law requiring waiting periods for rifles, I've received many questions about blackpowder replicas of Civil War weapons. Here are various links with some excerpts from them concerning CW replicas.
State laws vary on shipping black powder reproductions.
Check your local and state laws for restrictions. The following is a link to the NRA summary page on state laws. Click on the USA map for the state you are interested in. Antique Muskets and replicas are exempt from the Brady NIC checks. See NRA guide to Federal law for general info.