Ab8 has gotten bad reviews lately, but that's normally because it's performance does not match up with it's price. If you love customizing your gun, then you can buy Ab8. Ab8 isn't horrible, but it's not well matched up with it's current price. You're paying lots of extra money for the gun skin customization ability.

The rough stats
Rate of fire: Handgun
Damage: 7 (I think, but will get changed soon to 8)
Clip: ??
Freeze: About m4 freeze
Spread: Tight