The coolest AR-15 Uppers

[I-AM-THE-REAPER]

In a night of boredom, i went on a search for the coolest ar-15 upper recievers, what i found was a 5.7mm fed by P90 magazines, and this http://www.youtube.com/watch?v=iX7vwivR6cE , if you find any cool ones, post it up, i'd like to know about them

[I-AM-THE-REAPER]

Oh, I found a 50BMG upper, runs about $1500 lol

[azsarge]

In a night of boredom, i went on a search for the coolest ar-15 upper recievers, what i found was a 5.7mm fed by P90 magazines, and this http://www.youtube.com/watch?v=iX7vwivR6cE , if you find any cool ones, post it up, i'd like to know about them

The AR-57 is a neat upper.  The spent cases eject out the magazine well on your AR lower.  

Still just a novelty.

[MP5 NOOB]

FTW!!!

http://www.youtube.com/watch?v=rPWhLTPnQVc

You can get semi auto and auto versions for ar-15 lowers. They run around $2000 though.

[I-AM-THE-REAPER]

Dude thats awesome, belt fed.22s. I can't believe that when i posted this i forgot the Alexander Arms .50 Beowulf upper, now thats badass lol