First off, he didn't build the gun, zinllin did. He just chimed in on what HE saw as immediate useful purposes.Secondly - don't presume you know squat sparky. It looks to me like he built it primarily because it's a fun and interesting build. HE might have even different reasons. It would actually be a relatively practical camp defense gun for hunting camps here in bc where bears are a real issue ( i prefer a full stock, but there are definitely those who go with pistol grips and lasers. ) And I wasn't really kidding about the 'fruit zombies' - that would be a very fun gun for just setting up a bunch of targets and fruit and popcans and such and blasting away. That would actually be quite entertaining - i've done it with pistol grip pumps before and I have one friend who absolutely loves shooting like that - he tried a lazer but honestly he's absolutely amazing from the hip without one.And - if someone wanted to play with a 'tactical' build that doesn't mean they built it to actually use it in the real world, just like everyone who own's an AR isn't a mall ninja and isn't preparing to fend off an invasion or defend his bunker after doomsday. Sometimes it's just fun to see how a build would perform in that role after you've got it built, without intending to use it for that purpose.Honestly - i thought it was a great and creative build. I'd love to play with that gun and see how it handled and such. I would not bother with all that crap on it if i was serious about defending my life - but I'd enjoy seeing how it did just having fun with it. I thought he did a great job of macgyvering it together and I bet just building it was a hoot - and that's reason enough to build it.It's just a hair offensive that you'd suggest there's "Only one reason" for a gun like that. It's a little close to the anti's bullcrap about how guns ONLY have one purpose - to kill people. No - there's a LOT of other great reasons why you might very well put a gun like that together and honestly i'm impressed, I'll be even MORE impressed if it holds together when you shoot it, but that's half the fun tooI'd be cautious in the future about telling people why THEY build a gun.