IMHO you've made a nice purchase. I have owned/used one since the 1970's when they were first made.
Don't know what to say about your lock/trigger issue but the Forum has some good advice. I've not had a problem.
Perfect fit for me (5'9" 32" sleeve), light weight, both barrels shoot shot pretty much POA when sighting down rib, PRB lower barrel on POA, upper about 6" higher at 25yds.
But ... needs some TLC, especially on lower barrel (longer flash channel) because it can fill with oil, etc from previous cleaning. Some suggest using musket caps since some claim they have more output than #11. I found removing both nipples and giving each hole a fizz can shot of brake/carb cleaner, snap 2-3 caps, then load. I've not found a difference between musket & #11 caps (both nipple sizes are available from ToTW). Some also trickle some 4F in the holes, replace nipples, fire into ground to assure good ignition.
Reloading in the field is straightforward. The ramrod provided is really slender and I'm concerned about breaking it. Be carefull to grasp it near the muzzle when reloading. I tapered a fiberglass rod to fit the thimbles but it's ugly so I only use it when hunting.
Best of luck with this shotgun!