Shocknife's SK-2 training knife doesn't just simulate the look and feel of a knife. It also simulates the feeling of a knife cutting you if you make a mistake and get "cut" in training. It uses electricity to fool your skin into believing it has been cut. The feeling can vary from a paper cut, to a razor slash, to a knife cut, depending on the setting. When you get hit with the Shocknife SK-2, you feel it, even through clothing. Shocknife's simpler, less expensive version called the StressBlade has one setting equivalent to the highest on the SK-2. Of course, appropriate face guards and pads are recommended when using both.
The Kel-Tec KSG is made to be like no other tactical shotgun.