Wow, this looks like fun !(vid@link)....... < <broken link removed> > 100% legal to own and use! Slide Fire Solutions' ground breaking "Slide Stock" technology and ergonomic design provide individuals the ability to Bump Fire more safely - offering another element of entertainment for recreational shooters everywhere! You can now safely and accurately bump-fire your AR-15 at an incredible rate. Each SSAR-15 comes with a Hex Key to remove the factory pistol grip, Interface Block, SSAR-15 Rifle Stock, BATFE Approval Letter, and Installation / Operation Instructions.