The 12.7mm M-16 may be the perfect weapon for movie SWAT teams facing comicbook supervillains and/or supernatural horrors:
LW15.499 (Leitner-Wise Rifle Company) mini-.50 caliber (12.7mm) rifle is based on the M-16, but uses a shorter (than the standard .50 caliber) 12.7mm round. The mini-.50 rifles cost $1,450 to $2,250 each and weigh 6.3 pounds unloaded. The rifle is 36.2 inches long. Ammunition costs a 80 cents to five dollars a round (each one weighs about 1.1 ounces, with the most expensive ones being the armor piercing round). For a thousand bucks, you can get an upgrade kit for an AR-15 (the civilian version of the M-16). Fully loaded, with a ten round magazine, the weapon weighs about eight pounds.