This company sells non-firing replicas.
http://www.militaryheritage.com/muskets.htm
Non-Firing State
We sell historically accurate muskets and pistols in a non-firing state. This allows us to comply with various local, state, national and international firearms regulations, along with shipping company policy restrictions.
A certified gunsmith may decide to alter a musket or pistol to a firing state by drilling the vent hole and test firing it. We are not legally responsible for any changes from its present state. Please read our Conditions of Use and Legal Disclaimer. The customer is expected to be aware of the laws of their locality that govern products of this nature.