The standard pre-M16A2 "Daylight Sight System" uses an AR-15-style L-type flip, two aperture rear sight featuring two combat settings: short-range and long-range , marked 'L'. The pre-M16A2 "Daylight Sight System" short-range and long-range zeros are with M193 ammunition. The rear sight features a windage drum that can be adjusted during zeroing with about 1 MOA increments. The front sight is a tapered round post of approximately diameter adjustable during zeroing in about 1 MOA increments. A cartridge or tool is required to (re)zero the sight line.
The standard pre-M16A2 "Daylight Sight System" uses an AR-15-style L-type flip two aperture rear sight featuring two combat settings short-range and long-range  marked 'L' The pre-M16A2 "Daylight Sight System" short-range and long-range zeros are with M193 ammunition The rear sight features a windage drum that can be adjusted during zeroing with about 1 MOA increments The front sight is a tapered round post of approximately diameter adjustable during zeroing in about 1 MOA increments A cartridge or tool is required to (re)zero the sight line