Yeah, that setup is rough. The only strong late game weapons the Riot Shotgun, Triple Barreled Shotgun (which is hard to guarantee the ammo for sometimes), and the Signature Special. I'm not a Telescopic Sight Rifle fan myself, though I've seen people do funny tricks with it (usually involving other high powered weapons). This is actually a bit of a problem with Alliance. Consider replacing either the Flash Grenade pile or the Telescope Sight Rifle with the Lightning Hawk pile from outbreak.