Hunting, Competition, Police, & Military shooters, all desire versatility in sighting options.The ArmaLite M-15A4 SPR line is an efficient platform on which to build mulitiple sighting options. The M15A4 offers the flexibility of the Picatinny rail applied to the time-honored service rifle model. Light recoiling and dead on accurate, the M15A4 Special Purpose Rifle line accepts ArmaLite's removable iron front sight, carry handle or scope mounts as well as other devices conforming to the MIL STD 1913(Picatinny) rail.