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KeyMod is a universal interface system for firearm accessory components designed to be superior to the MIL-STD-1913 accessory rails.LTOR Weapon Systems had previously pursued a design which was the basis for the KeyMod system. While developing the first prototype systems Eric Kincel of VLTOR Weapon systems was approached by John Noveske of Noveske Rifleworks with a design for a universal accessory attachment system.
In Unix-like operating systems, chmod is the command and system call which may change the access permissions to file system objects (files and directories). It may also alter special mode flags. The request is filtered by the umask. The name is an abbreviation of change mode.