Free: Contests & Raffles.
the 16 guage seems to be the problem
If the gun is that old, it would have a fixed choke barrel. For another choke size you would have to buy another barrel.
Forget the bear spray, use wasp killer. Concentrated delivery stream, 10X the product, and only $3.00 on sale.
The reason there are so many Ruger upgrades is because they're necessary.