Jim and Patricia Searls owned JP Rifle Stocks until they sold it to someone around 2000 +/-. The new owner has not done anything with it that I have heard of. It was located in Las Vegas and run out of their garage. After the business was sold, they moved to CA to raise hunting dogs.
The JP McCoy is valued anywhere from $690 to 350 depending on condition. Add $20 for flintlock.
I had one of their JP Henry's for a while. It was a great gun, really liked it. Stupidly, I sold it. Dumb, dumb, dumb!!
Values from 6th Edition Blue Book of Modern Black Powder Arms.
Hope this helps.
John