Heh... I just did some research on a parcel (I do title searches for law firms) that used to be a Naval Ordnance Depot... before that, it was owned by US Rubber, which had a contract for making 40mm Bofors ammo.... I'd imagine a few quad 40's could take out a good many of those oncoming drones...Yep.
Frankly I think the US militaries post WW2 policies regarding ground based air defense is inherently flawed. Especially now with the threat of Drone Swarms being a real thing.
If you're base has twenty stingers that can be launched and you've got a hundred drones coming at you then you're in serious trouble.