OOOHH Man! Here the thumper is! This is a custom built 50 beowulf upper for your ar-15. This is as quick play as it gets,just pull two pins, Click this beowulf upper on your ar 15 lower,and you know have 50 cal power at your finger tips! Boasting a velocity of 1,870 fps, and 2,330 ftlbs of energy,this round has some serious power.Wether your doing a whole new build and need an interesting twist,of just wanna have a caliber exchange for you favorite AR-15 platfom,this upper kit never ceases to impress, destroy targets,And be a heck of alotta fun to thrash with!