I just bought a nice little single shot 410 gage CZ. Turns out the trigger is ridiculously heavy.. like 15 to 20 lbs. Hoping someone knew about these guns and could advise. It's an exposed hammer break action single shot where you pull back on the trigger guard to open the action. There are three punch pins in the receiver but it's not clear how the receiver comes apart or what I'll find when open. CZ doesn't have a manual on their site (the gun was discontinued last year). I doubt it's very difficult but wanted advise from someone in the know before I started. Thanks and happy shooting.