i think that the matchlock gun could definitly use a boost it in all honesty is way to under powered i think it should atleast be able to take out a big red bat in 1-2 shots.
if you make it so it can one shot a big red bat you should increase the reload time by about 0.5 seconds if it 2-shots big red bats then you would be better off leaving it at the same reload and shot speed.
just a suggestion. ; )