This is the Nerf ZombieStrike "Zed Squad" Chainsaw. Before you get all excited, realize that this is made by Nerf, so it's just a big flimsy piece of foam you can add on to your blaster. But, as these pictures show, it really looks quite good on blasters. If you're into dressing up your blaster, this is a must-have accessory. If you're into practicality over being a photo king, you can probably skip this one.
Check out more photos of the ZS Chainsaw on Tactical Tag's Facebook Page. You can also see the video review after the jump!