Daniel, Understanding Wayne's question is probably correct there are numerous discussions and probably documentation to provide you a partial answer.
Specifically; during the Rev War there were several American Armories that were in place to repair old and/or broken battle weapons. Several of these Armories are documented and several are not.
Searching the term 'Committee of Safety' muskets might get you further along toward an answer as well. Generally these guns are American restocked weapons using foreign parts.
It wasn't too long ago that Williamsburg,Va. sold off 15 or 20 restocked Brown Bess muskets. Apparently the parts were still available from broken guns and the current operating Williamsburg gun shop did the restocking. Actually, it could have been done many years ago as the auction catalog only stated 'restocked'.
Early accounts of the Rev War will verify the early Continental soldiers were armed with anything their officers could find. It wasn't until the French entered the fray that our troops had somewhat suitable and consistant caliber weapons. But here again, the French weren't stupid. The American cause provided an excuse to support the effort from one point but when reviewed closely we were a dumping ground for muskets from their old storage facilities. Some were in good shape; others needed vast attention. This type info is documented.
Additionally, American gunsmiths were exempt from 'front line' duty if in fact they served their time in the Armories during the war. Their specific duty was to rebuild, repair and return the weapons to the battle lines. This info is documented as well.
Believing Wayne interpreted your question correctly you now have several places to look for further info. Please share with us what you find. Regards, HIB