$scale

From Valve Developer Community

The QC command $scale multiplies the size of the input meshes by a float value. The default value is 1.

Image:note.png Note: $scale only affects .SMD file references (such as $body or $model) that are below it in the QC. For this reason, be sure to specify it before any file references!
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Syntax 

$scale <scale amount>
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Example 

$scale			3
$modelname		"weapons/shell.mdl"
$cdmaterials		"models/weapons/"
$body		shell	"shell_ref.smd"
$sequence	idle	"shell_idle.smd"
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