>> justin: our muzzle break is the only kind that actually reduces recoil, muzzle rise, and flash. >> anthony: they own jmac customs, a home business that designs and builds custom weapons and parts. >> justin: so this keeps you on target, makes sure that you're safe while you're shooting. put the mag in. >> tony: safety off. >> justin: safety off. you got it. >> tony: all right. >> justin: 3, 2, 1. >> anthony: now, to be clear, these are fully automatic firearms. they cannot be purchased legally by individuals anywhere. but as they're in the business, these guys can apply for special, highly-vetted atf licenses for purposes of product development and testing. >> tony: that was just really- that was a lot of fun. i'm a child, what can i say? >> ashley: who wants to blow up pumpkins? >> justin: just mixed up a binary explosive.