It is well known that COL Crockett traded off his caplock rifle in Arkansas, on the way to Texas for a good-quality flintlock rifle, according to the curator of The Alamo Shrine.
Further, it is believed by most historians of The TX Revolution that at least HALF of long-arms in Texas were various versions of the trusty Brown Bess. Charleyville muskets of the AWI period were also commonplace in LA & TX.
(Most emigrants to pre-revolutionary Texas-Coahuila were "dirt poor", were often fleeing from the law or some other "untoward situation" & many such emigrants arrived in Texas with literally nothing more than the clothes on their back, some sort of firearm and/or blade & "riding shank's mare".)
The Bess was very popular in Texas as it was widely available in the USA/Mexico, was cheap to buy or trade for and worked with shot and/or ball as well as any other long-arm of the period generally did.
According to Captain Juan Seguin, when Gen Cos surrendered to COL Milam's troops after The Battle of Bejar, several hundred Brown Bess muskets, many containers of (REALLY POOR QUALITY) black powder and several hundred pounds of musket balls were also surrendered to the TX forces.
CPT Seguin later stated that the Alamo defenders had 5-10 Bess muskets each, which were loaded & ready to fire, as well as their personally owned weapons.
After the Battle of the Alamo & Goliad, MOST of the firearms in the hands of new TX militiamen were "surrendered" Brown Bess muskets from The Battle of Bejar, so the number surrendered must have been quite large. Also, given that Mexican soldiers often "fell by the wayside", were killed from ambush by Apache/Tsalagi warriors or deserted the Mexican Army, a sizeable number of muskets were gathered up for "reissue" to the TX militia.
(Many new emigrants, who rushed to join GEN Houston's fledgling army, arrived afoot, with NO firearm & often not even a knife.)
As a result of the varied methods of arming the TX Provisional Army, by the day of San Jacinto ALL of the Texans were reportedly armed with some sort of "suitable" longarm, powder & shot.
It is my GUESS that MOST of those "suitable" longarms were Brown Bess muskets, of varied types.)
yours, satx