Probably not worth it as a business concern. You could buy a bench grinder and do them yourself. It's not rocket science. The most important thing is to keep the tip cool with frequent water dips. If it changes color, you've already screwed up.
Looks like a glovebox or tackle box gun. All the parts appear salvageable, though removing the rust on exposed parts like the release latch screw will require re-bluing, at least with a cold blue product. Flat parts might respond well to judicious use of a fine file. Round parts can be put in a...
I once watched a smith at Mt Vernon fashion square nails. It sure gave me humble appreciation for being able to go to Lowes or Home Depot and buy hundreds of nails for relatively little money!
Congrats! My son just told me a co-worker of his is getting married this weekend - so far they have spent over $120,000 for the wedding. That's crazy. :rolleyes: