Quoted:
Bought an old Fox BST on a whim. Single trigger, 20 ga., barrels cut to 18 3/8", stock shortened. Yes, it's NFA legal, about 28.5" OAL. It's old enough to not have a serial number. Got the dealer to throw it in to sweeten the deal when I sold him some rifles.

1. Right firing pin sticks in its hole. I assume the spring's broken, and the pin may be peened as well. I can see the retaining screw when the stock's removed. Can this be fixed without disassembling the receiver? IOW, can I remove the screw, FP, and spring from the back of the receiver and get it back together? Any chance of matching the spring out of the local hardware store (good selection of springs there)?
It does fire as it sits now. Yes you should be able to but I usually just do so to get it out and yes the firing pin will need to be removed and replaced or cleaned up and reheat treated.

2. The whole thing seems kinda "sticky" when it opens, esp. when I compare it to brand new guns. I've cleaned it up some, including crocus cloth and oil on the pivot pin, and it's better, but is there anything else I can do to make opening easier?  Stop don't do that any more The lugs are set back some and if you remove to much from pivot the bnarrels will be loose. This is a DYI only if you understand the relationship between barrels standing breech and the pivot latch. That I don't know only you do.

3. The whole thing's in the white, there was very little bluing left on it. Should I rough polish and cold blue it? Just paint it? Don't really want to get too spendy with a hot blue job or Duracoat.