Half-Life 2 Garry's Mod Cannon Map

Cannon is a Single Player Garrys Mod Map compatable with Garrys Mod V7A +, It adds a huge cannon that fires out massive concrete pipes.
How To Use The Cannon -Get out your multitool and click on 'Timed Explosion' then get on top of the cannon and climb inside the barral. Next plant loads of Timed Explosives in the back of it. (See screenshot 1) -After that spawn 'Pipe 1' by holdi