With the Nerf Stampede now available in stores, i've managed to get alot more sets to tinker and modify. I will be posting up a series of Mod Guides on the Nerf Stampede soon.
In the meantime, here is a glimpse at how increases in voltage affect the Stampede's Rate-of-Fire (RoF).
Important Disclaimer: DO NOT attempt this modification unless you are familiar with electrical circuits and accept if your blaster is damaged in the process! Modify at your own risk!
Refer to this follow-up link below for the test results and optimal RoF recommendations: