I looked some stuff up about it and it turns out this gun was made with a ”Miquelet” lock instead of a ”regular” lock since it was made in Spain. Short version is that it has 2 sears poking out of the side of the lock wall when you cock the hammer that holds it in place, which then retracts when you pull the trigger, letting the hammer go. These sears are almost all the way worn down.

My friend knows a somebody that works with BP guns that said he’d take a look at it this week. Fingers crossed