AR Barrels

[RoyalTenenbaum]

What is the purpose of the area of indentation about 1/3 the distance from the muzzle on some AR15s?

 

[IndyGunworks]

its the place where an m203 grenade launchers mounting bracket has a strap that goes accross the barrel and torques itself into place. without it the barrel will flex downward when the m203 is mounted.

natrally it just transitioned over to the civilian market for the "cool" factor (not to be confused w/ tactical) and serves no real purpose on a gun that will never have a m203 mounted.

 

[IndyGunworks]

hope that was a quick enough answer for ya.

 

[RoyalTenenbaum]

hope that was a quick enough answer for ya.

Yup. I assumed it had to do with a standardized attachment of some sort.

 

[sgreen3]

m203

 

[jblomenberg16]

Here's some good info, and some pics down at the bottom.

M203 grenade launcher - Wikipedia, the free encyclopedia

 

[N_K_1984]

There is also another option: The KAC Master Key

http://en.wikipedia.org/wiki/KAC_Masterkey