Presuming it has a modern setting - akin to Bad Company 2 with the bonus WWII M1 Garand and M1A1 Thompson weapons (M1911 too, although I think that will show up anyway with a more modern or period-appropriate model).
I think both those would be great to see again, especially given that the Garand was a late show to BFV.
I also think the Peacekeeper SAA would be a fun sidearm to see again (probably with simpler animations), and maybe the Martini-Henry would be another fun option.