Name this gasthru/foregrip

[SpitFire1299]

While on ebay, i looked at a mag and noticed this cool/funky looking purple foregrip. Please help me identify it! :D

http://i14.ebayimg.com/02/i/06/fb/5f/ec_12.JPG

[tyrion2323]

it's an expansion chamber.

ans, perhaps?

[Z-man]

Yep looks like an ANS chamber. Could be an ANS Phase 2 series.