I also have an older Remingtom M11 for HD. I bought it for $75.00 from a fellow that kept it on his fishing boat. "For sharks" he said.
The end of the barrel was rotted out from blood & salt water and the receiver was pitted pretty bad also. I had to shorten the barrel in the lathe to 21" and solder on a new front sight.
I then polished up the receiver as best I could and put on a 2 shot mag extension. I sanded and put a coat of laquer on the stock and forearm. A shake & bake finish was the final touch to cover my mistakes.
I was a little concerned if it would cycle with the shortened barrel but it works great. I may add a recoil pad later.
Total cost: A little under $200.00.
A man can never have too much red wine, too many books, or too much ammunition.