The non pal GCN version had the best weapon balance IMO, although I think a few tweaks could help... Buff the first 2 shotguns or nerf the striker a bit. (I say make the normal shotgun exclusive critical hit % increase) Maybe increase the Riot gun's damage to 12 (8 or 10 at range) The striker has so much good in it even without it being strong, so giving the riot gun more strength won't hurt the striker's usefulness.
The BAR is a good option for its extra 3 damage and space saving aspect over the SAR.
Then add a bunch of extras and add some stuff from the "Should they add anything" topic.
"Maybe I'm not yelling loud enough... On earth, everybody is always looking for a giant squid! On my planet - " - Zoidberg