Maryland was pretty well armed as colonies go, and had "carbines" as far back as the 17th century. This continued through the French & Indian War. What the difference is between a "short musket" and a "carbine" is not noted, but I'd think that a firelock that used musket ball, but was shorter than their "normal" might be the answer, as it's obvious from the inventories which show "carbine ball" that the calibers of the carbines were different than muskets.
ARCHIVES OF MAYLAND ONLINE
These are to Signify That I Thomas Smithsons Custody of Talbott County in the Province abovesd doe acknowledge to have in my Custody, these Severall armes & ammunition belonging to his Majesty & this Province Vizt
Forty six firelocks Muskets all fixt, one hand mortar, 2 Grannado pouches, 20 Granado Shells & 57 fuzees, one brass Lanthorne, one brass Compass, one horse Picker, one Prospect Glass, 1 Drum, 1 Trumpett, 1 Powder prover 2 pair of Lib. H. D. Drum heads, 7 Case of Pistolls
7 Carbines & belts, 2 pick axes & 2 Mattocks 5 Cartooch boxes & belts 5 baggonetts & belts, Plates, 4 Spikes & four Rings for Wheelbarrowes, 4 Steel Spades & Shovells, 2 barrells of musket balls, 2 ditto Carbine, 2 ditto Pistoll, a parcell of flints said to be 3460.
Wittness my hand this 5th day of Octobr 1697.
September 24, 1756.
Major Hyland brings in and delivers to M.r Speaker the follow-
ing Report Viz.t
By the Committee appointed by the Honble the house of Dele-
gates to Inspect the Arms and Ammunition and Accounts relating
thereto September 21.st 1756.
Your Committee having Inspected the Arms and Ammunition in
the City of Annapolis do find that there are in the Possession of the
Armourer the following Arms and Ammunition …,
Seventy nine Pistols, in good Order, eight Pistols the Locks very much out of Repair, one hundred and thirty five Carbines in good order, Sixteen good broad Swords, fourteen Carbines, locks out of repair…, And your Committee find that Since the Last Session
there has been Returned to the Armourer the following Arms Viz From the Town Company Twenty five Musquets, twelve new Carbines, four old Ditto…,
there appears to have been delivered as follows Viz.t …, To Fort Frederick, Nineteen new fire Locks, Bayonets, Cartouch boxes and Slings fifteen new Carbines, five old Ditto, twelve Carbine bayonets, nine Slings…, Case of Pistols, one box of flints, eight half Barrels of Gunpowder, Six hundred and Sixteen weight of Musquet Ball, two hundred and fifty five pounds of Swan Shot Two hundred Sixty eight pounds of Carbine ball,
By the Committee appointed by the honble House of Delegates to
Inspect into the State and Condition of the Arms and Ammunition
and Accounts relating thereto. October 24,th 1763
…, Above the Conference Chamber
85 Black hilted Swords, 42 Bright ditto. 15 Cutlasses. 35 Pistols
one New Drum & one Old ditto. 200 New Bayonets with Cartouch
Boxes & Bullet Molds.
90 Buff Belts
29 Old Bayonets
86 fire Locks Short Muskets & Carbines
68 old Muskets and Carbines some without Locks and many with Broken Locks…,
30 Blue Cases for Muskets, 10 listed Cases for Carbines, 5 half Pikes, 15 pair Drum Sticks, 11 New Carbine Slings, 7 New Cartouch Boxes, 9 Old Belts for Muskets 2 Cw.t Gun Powder 1/4 Cw.t of Musket Ball and great Shot
LD