Cold/DP Good? Bad?

After seeing a post where someone took down an AV with a Cold/Rad I thought about trying a Cold/DP
Is this a good idea? Has anyone played with this combo before?
I know Cold has an amazing set of debuffs but is that enough to up the damage of DP?

So far its been slow going. I like DP it just seems like I'm pecking away at them.

It's going to be very, very slow at first. However, at high levels, you'll be an amazing defensive character that can still contribute a lot of offense. Dual pistols' damage debuffs will stack pretty well with benumb, making you very good at debuffing archvillains. However, if you're looking for something that will solo archvillains, you might want to look elsewhere.

I actually have a Cold/DP Defender.

Cold Bullets will be very redundant, especially if you take Snow Storm. You can hit recharge and slow caps with Sleet and Snow Storm easily as you will be doing -132.5% slow and -112.5% Recharge. That's when cap is -90% slow and -75% for recharge. You're already over and beyond the cap, so it'll help keep bosses and the like a cap as well.

That leaves you with your fire bullets and toxic rounds (assuming you're going to be swapping). Fire will give you more damage, naturally. Toxic will stack with Benumb, as already stated, but that's against one enemy. Toxic is a nice compliment for your Ice Shields as not only will your team have decent defenses, but will be hurt less when they are. Also, you'll be attacking the enemy, which means they are also dying.

Basically for me and my Cold/DP, if the team is have zero survivability issues, I switch to Fire Ammo except for EB/AV fights (and even then, depending on how well the team is doing). The damage debuff is nice on toxic, but if they aren't getting hurt and when they are, it's not noticeable anyhow, why not deal a bit of extra damage yourself and contribute more to the team since the damage debuff on that team wasn't needed. Monitor your team and make adjustments if need be (between Fire/Toxic Ammo).

As for Standard Ammo, meh. Knockback can be nice in certain situations, but overall you'll get more bang for your buck with Fire or Toxic, depending on what your team is needing more of.

I to would like to see a end build for someone like this.