i have a model 16 fhsak in 308win. i am currently renovating it w a mcgowan barrel and bead blasted texture. ive talked to SSS and lisa has told me the smooth nut and grooved one are the exact same specs except for the grooves so they are interchangable. the grooved one is just easier to remove.

mine also has the wedge but i upgraded to an SSS recoil lug (which is accustock compatible and is not listed on their website and has the locating pin since the factory one doesnt) which is now to big to use the wedge so im gonna do without it since savage abandoned the wedge idea anyway.

i also plan to keep this rifle w the accustock and build another for bedding in a nice thumbhole laminate stock.
2 rifles are better than one!! :)

brian