Antweight Combat Robot - Part 2: Weapon

I built an antweight class (1lb) combat robot for RoboGames 2015. This is a 3 part video series about the design, materials, weapon, and electronics that go into building a combat robot.
Here is a list of parts I used:
ZIPPY Compact 500mAh 3S 25C Lipo Pack -
D822/17 Brushless Outrunner 1100kv -
Afro Slim 20Amp Multi-rotor Motor Speed Controller -
TinyESC -
Micro Gearmotor - 460 RPM -
OrangeRx R410X DSMX Compatible 4Ch/6CH Receiver -
Turnigy 9X 9Ch Transmitter -
OrangeRX DSMX / DSM2 Compatible Module -
Garolite G-10 Plates -
Fingertech Mini Power Switch -