You can't get a heartbeat sensor on a secondary weapon in the game. The only possible way is to do some sort of hack on it, which is probably not the best thing to do.
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itdepends on the map but i think heartbeat sensor is awesome but some people get ninja perk so they cant be seen by it
Ninja Normal - Nonseen On Heartbeat Sensor Ninja Pro - Nonseen on Heartbeat Sensor + Dead Silence (can hardly hear your feet when u walk or run)
Heartbeat is definitely the way to go. First, UAV only lasts for a little while, 30 seconds I think; although it works all across the map. However, heartbeat sensor is always working. And although it has a smaller range, it never runs out.
the flamethrower or aa12 k costs 2400 coins and are u sure it does
How do you unban multiplayer on your xbox 360