Is there any way to stealthy kill a heavy gunner or heavy flame unit without a silenced weapon?

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I am clearing outposts and am trying to do them silently. There are times that I am not able to silently disable the alarms without alerting a few soldiers. So far I haven't found a good way to silently take down heavy units without a silenced weapon - so I have been clearing everyone else in the camp and leaving the heavy units last. Is there anyway to silently take them down without a silenced weapon? Takedowns aren't an option and arrows just bounce off of them.
I haven't unlocked silenced weapons yet.
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How do you kill the heavy gunners in Far Cry 3?
The Heavy Gunner can be killed with a Heavy Beatdown. It can not be killed with a normal Takedown. A headshot with the Z93 will instantly kill the Heavy Gunner, so will three torso shots using this weapon. There is a (very rare) chance that a direct impact with a GL-94 round will instantly kill them.How do you kill the heavy gunners in Far Cry 4?
EDIT: You can kill heavies by stabbing them in the back of the head, as well as hitting the back of the head with an arrow. I'd just like to mention that you can also kill the heavy with a single knife or arrow if it hits them in the unprotected back part of their head.How do you kill the armored guards in Far Cry 4?
If you have a rocket launcher or a grenade launcher (preferably the GL-A87), you can kill them with a couple of grenade launcher rounds or rockets. As with regular Heavy gunners, the Heavy Takedown skill can allow you to kill them with a takedown. Their elite variant is Royal Guard Heavy Gunner Commander.Far Cry Stealth Tips - 15 Tips and Tricks Every Stealth Player Should Know
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Images: Charles Parker, Maarten van den Heuvel, SpaceX, SpaceX