Bear in mind that the "Prattville Dragoons" organized before the war as an AVC company. The AVC law passed in February 1860 raised taxes to pay for arms such as these. About the time of Lincoln's election, enough money had been raised to purchase arms for 8,000 men expected to be in uniform as members of the AVC. In January 1861, the Alabama legislature asked for an account of how money was spent on arms. Governor Moore quickly complied, so we have an inventory of arms purchased long before capture of the Mount Vernon armory.
Since some members of the Alabama state senate questioned the quality of rifled muskets purchased, the senate record includes records of target practice with these weapons. They were quite favorable. Governor Moore had purchased 3,500 of these firearms from the U.S. military at $2.50 each, 1,000 on Sept. 27, 1860 and 2,500 on Nov. 14, 1860.
Concerning arms at Mount Vernon, the following two paragraphs are taken from Claud E. Fuller and Richard D. Steuart, Firearms of the Confederacy (1944), pages 1-28.
According to Josiah Gorgas, 19,455 small arms were seized at Mount Vernon. These included 17,370 percussion muskets (cal. 69) , 2,032 Harpers Ferry rifles, 20 U.S. rifles (evidently cal. 54) and 33 percussion pistols. The latter were likely single-shot firearms.
Shortly after the Harpers Ferry raid, the Secretary of War authorized immediate transfer of 115,000 percussion muskets and rifles to five Southern arsenals. Shipments were authorized in Washington on Jan. 28, 1860. Capt. J. L. Reno at Mount Vernon received 9,280 percussion and 5,720 altered percussion muskets, all cal. 69. 750 boxes of arms came from the Springfield Armory, another 100 boxes being shipped from the Watertown Arsenal. Each box weighed about 300 lbs.