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Weapon recoils, the inertia of that recoil allows it to come back and cycle quicker where you leave your trigger finger in place at one time at one position. and it allows that weapon to cycle at a fast rate. it is just another way of taking a semi automatic rifle and turning it into a fully automatic machine gun. >> sandra: it doesn't actually do so, right? it doesn't become classified as a fully automatic weapon with this conversion kit. but it fires as one, right? is that the distinction to be made? >> that's a loophole. actually what it is, it's just a different device that allows a semi a...

Atf is insured that i'm allowed to have that fully automatic weapon because i have purchased that trigger group. what this allows you to do is get a very similar, if not exact same type of action out of that weapon, but not have to go through the federal background check. so really what it's doing is it's still allowing you to make it into a machine gun. it is a loophole device. >> sandra: it sound like a complicated issue to many of us. is this something the average civilian who wants to make this conversion, is this something they can learn to do? is it easily learned? is it a complicated pr...

Require registration, don't require background checks or serial numbers and can be purchased easily via the web or out of magazines. here is what the santa monica police told us. >> you can buy legally certain parts, it's called an 80%, you can buy those parts and an under reseverer, the over and understander and put them together with a trigger group and manufacture your own gun with adjustments. in this particular case the weapon he ended up with was by definition would be illegal to possess here in the state of california. >> reporter: under federal law it's perfectly legal to own it if you...

You hear the police chief saying it was a farewell note. they're not characterizing it as a suicide note. the remorse he expressed about his father and brother, almost more brief mentions. he took lengths and lengths to say farewell to his friends, brooke. that's how police are characterizing it. a disappointment for investigators, it doesn't reveal as much as they had hoped as far as his motivations. >> about what about the gun? we're learning he built this gun. how did he do this? >> this is certainly going to alarm a lot of people, especially here in the state of california where laws are c...