got a blue sniper with the perk "shoot to loot" picks up any ammo if you shoot it will come in handy for raids and nightfalls
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You can get the same perk on Uncommon Scout Rifles so that you don't lose Special ammo when you switch weapons.
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Even better on a scout rifle so you don't lose ammo. Sometimes (rarely) the gunsmith sells them. More commonly you get it as a drop.