Easy Kills:
There are easy ways to kill people with a Spider Clamp Turret and there are good hiding places for them and I will tell you the hiding places for them on Tombstone.

. Behind your flag in the flag room so you can't see it.
.above the main doorway for your main base, and cameras in the hall for the doorway.
.And behind the brick supports for your main base.

It will be hard for them to find it.

999 Ammo:
Press ~ to display the debug menu, type $testcheats=1; Then, open the debug menu again and type giveall(); to get all weapons with 999 ammo

Brilliant Sniping Tip:
To be a really good sniper i.e. get loads of kills, use the humble blaster. Aim using the 'a' key ang then let loose a volley of about 15 shots on a steady target.