Also the cutout was part of the M4 design for the military. It's for the mounting bracket when mounting a M203 grenade launcher.
Colorado AR-15 Shooters Club Discussion Forums
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Also the cutout was part of the M4 design for the military. It's for the mounting bracket when mounting a M203 grenade launcher.
"Owning a handgun doesn't make you armed any more than owning a guitar makes you a musician." - Col. Jeff Cooper
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