Anyone get the A pin pops a balloon challenge done?

[Skarwind]

I keep staggering them with other weps then switch to the pistol but the damn thing won't die.

[Angry Harold]

yea, but i must have staggered the mancubus at least 5 times. he dies eventually, just keep plugging away.

[LutenitKoala]

the best way to get the challenge is first get him staggered so hes at minimum health then let him recover. I recommend using the plasma rifle but anything should work. stagger him again with the plasma rifle. as soon as he's staggered, shoot about 5 more times. throw a siphon grenade quickly switch to the pistol and spam headshots. hope this helps

[Cormwyr]

Just got this myself. After he's staggered use a supercharged pistol shot. It seems to need to be fully charged or he'll recover. Make sure you aren't using the rune that makes Glory Kills easier.

[Twerk_Stain]

^yeah...This is one of those challenges that has had a lot of threads over the summer. I got it first try on first run by just headshotting him while staggered with a charged (and un-upgraded) pistol round.

I can't remember what runes I had equipped as it was a while ago...but obviously the one that makes them take more damage while staggered is one to remove for this.

I kind of recall it being siege'd gauss to head, normal gauss to chest, then charged pistol to head. First mancubus I saw, which came early in the level with little support to worry about...2 siege mode gauss shots will kill it, so just normal fire the 2nd shot to stagger. The hs hitbox is extremely forgiving, so it shouldn't be much trouble. Just forget spamming normal pistol shots, and take the extra couple of seconds to charge.

[Morton Koopa Jr.]

Pretty much what everyone said
-turn off that one rune that increases their dmg tolerance during stagger
-use charged pistol headshots (I'm assuming you're doing completionist stuff. So complete pistol upgrades first)

But I'm adding:
If you don't care about abusing checkpoints (well I guess it doesn't matter if you're still gonna try repeatedly), don't switch to pistol on stagger. Maintain your current weapon and see what damage you can get away with. But try and make it consistent. Then once you got the formula down. Bam. Charged pistol one shot.

[DGM-payne]

I was struggling with this quite a bit at first too, a google search brought me here. The only way I found to make it a real piece of cake and much less complicated than the above methods is to wait until going after the blue skull. In the room containing it are four pillars and a quad damage in the center. Wait part way into the fight until the mancubus start spawning to pick it up and lay into one of them with just the pistol, it'll go down pretty quick even without a lot of pistol upgrades (I had it upgraded very little by this point).