Tikka Tac A1 hand guard swap

Looking changing the handguard for a lighter BCM Mlock KMR rail. They are lighter than the factory Tikka handguard. I know the factory is not changeable however I found this at Midwest Gunworks Tikka Tac A1 Ar barrel nut. Anyone have one of these? Does the barrel nut thread on and off?
Or maybe a centurion c4 quad rail
 
Been interested in swapping mine out as well but don’t know of any others that fit. If you find one that works definitely let us know!