Pakistan Ordnance Factories have also developed a twin 106 mm recoilless rifle mount which, for trials purposes, has been fitted onto an M113A1 APC of the Pakistani Army. The system also integrates a laser rangefinder into the existing sight of the 106 mm recoilless rifle to replace the elbow telescope. This allows the range to be displayed for the gunner in the sighting optic, which means that he can apply the superelevation and fire without having to look at another instrument. The effective range of the recoilless rifles is 1,500 m. The locally produced vehicle is called the M113A2 Mk-1 in Pakistan Army service and is almost identical to the US M113 except that the 12.7 mm M2 machine gun has been replaced by a 12.7 mm Type 59 machine gun manufactured by Pakistan Ordnance factories. An anti-tank version of the M113A2 Mk-1 has recently been introduced into service and this is fitted with the locally designed Baktar Shikan anti-tank guided weapon which is very similar to the Chinese Red Arrow 8 system which entered production in 1987.