Something to consider before deciding to have your OEM 10-22 barrel muzzle threaded: What is the outside diameter behind the front sight? Is it sufficient to cut the 1/2x28 threads and leave a significant 'shoulder' for the muffler (or muzzle mount) to butt up against? Most OEM production barrels I've seen threaded were cut behind the front sight base where the barrel profile is thinnest and don't leave much of this 'shoulder'.
Just something to check before heading down that path.
Just something to check before heading down that path.