Assuming you’re referring to trials. It is the special ammo economy, absolutely nothing to do with forerunner. Bungie basically gave us unlimited special ammo.
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To be fair... nobody running bastion or jotunn. There's a reason forerunner is the most used gun.
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Not exactly true. A few games this weekend where I faced Jotunn players. I can very well recall the Titan shooting another 5 shots on my ghost.