You’re also going to need a 15x1.0 threaded can or adapter. There’s no guarantee that the stock threads are concentric and I can’t recall if there’s a shoulder or if it would index off of the muzzle.
They were fun rifles when they were $300. The aftermarket 20-rd box mag adapters made for a nice truck gun. Beyond that, they’re not worth what others are asking for them in my opinion. Same with the Ishapore .308 Enfields, but that’s another story.