Now in terms of weapons similar to sniper rifles the only other possibility as far as I know would be the TR-116, however the 116 is a projectile weapon not an energy weapon.
Shakaar and Kira use sniper rifles in the episode Shakaar. actually it's just a Klingon disruptor rifle with a scope there's nothing to suggest that it specifically designed or designated for use as a sniper weapon
Federation standard phaser rifles have a scope on. Well, most of them.