So there wasn't a "federal government" per se. There was Congress, which we often think of as the same as the current Federal government because it was the overall governing body for the colonies, as our government is for The States, but it had much much less authority. Some were funded by Congress, but it wasn't a "national" type purchase the way we think today.
The Maryland built muskets were contracted by several Committees of Safety within the colony. Some CoS muskets were contracted by a CoS at the county level, within a colony.
UM well, no not really. You must remember that SLP Bess were quite rare here in the colonies at the start of the hostilities, which is also the time when the colonies were building their own muskets. However, there were several types of LLP muskets that were available, not to mention the Dutch muskets.
So when one sees a musket that appears to be an original CoS musket, it's more than likely shortened to a length similar to the SLP Bess because the British shortened a lot of LLP muskets by 4" from 46" barrels down to 42".
This is pretty evident by the numerous rounded side plates that are found on CoS muskets, from several different colonies. The locks were quite often surplus locks, OR American made. So the SLP side plate being flat is a lot easier to make than the LLP style where the lock bolts are nestled into the lock plate. If they were copying the SLP they'd a used the flat side plate. They had no qualms about flat side plates when making French-ish CoS muskets or Dutch-like Cos muskets.
Massachusetts
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From the National Museum of American History
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From Virginia
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From Philadelphia PA
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LD