Board Thread:General Nerf discussion/@comment-27306930-20180210062416/@comment-34696132-20180214151309

There's no spin added to the dart. The SCAR barrel is just there to both add a touch more barrel length AND more importantly keep the dart centered while the significant amount of EXCESS output from the plunger is vented around the dart before it exits.

You can get a similar result with the "VF1" muzzle brake, albeit without any ability to make finer adjustments.