Hi all, I have a chance to buy a model 12 16 ga. (483261). What is there appears to be in good shape, but it is missing several parts. It has the trigger guard, but the trigger and the other parts attached to it are missing. Are any of these parts interchangeable with the 12 ga? Also, magazine spring, cap, pin etc. are missing. This gun was one that belonged to my late dad, and my mom is looking to sell it. What would be a fair price?