Golfing with your AR....
http://www.cheaperthandirt.com/ARR225-7.html
Works on most AR-15, M4, and M16 rifles; replaces your muzzle brake or flash hider. Machined out of solid-stock steel, shoots golf balls over 250 yards using .223 BLANKS (BAM-006), do not use live rounds. No gunsmithing required. WARNING: All rules of firearm safety apply. Misuse of the golf ball launcher is potentially dangerous, and it is not a toy.
FORE!!!