Info
This demo will show you how to upgrade a Sentray Gun with just one refill.
 
Commands needed to perform these tasks
bind "X" "build;wait;impulse 2"  // Build a sentry gun
 
alias d1 "dropammo;wait;impulse 4"  // Drops Cells (Cells are needed to upgrade Sentry Gun)
bind X "d1;wait;d1;wait;d1;wait;d1;wait;d1;wait;d1;wait;d1" // Drops 70 cells
 
*Note* Change X to a key that suits you best.