It is actually Stimpy's new secret PD weapon.
He goes to the shoot with a few of his buddies.
Stimpy stands up on the firing line and yells and waves his safety orange rifle around, and while the PDs come up to see what the comotion is all about, and while they are busy looking for their sunglasses, his buddies massacre them. Then Stimpy hands the safety orange rifle to a buddy who gives Stimpy his rifle, and they repeat it.
It is also the safest rifle ever built...it does its job without firing a single shot!