由于预算、技术和条令上的问题，随着许多计划搁浅，精确制导迫击炮弹药的研制也受阻。例如，英国军械署的８１ｍｍＭｅｒｌｉｎ没有投入生产，美国的计划一再推迟。Ｍｅｒｌｉｎ的一个主要缺点是弹头射击效果（由于受口径的限制）和制导系统发生的成本不相称。实际上，在前线 Due to budgetary, technical and regulatory issues, the development of precision-guided mortar and ammunition has also been hampered by many plans being stalled. For example, the British Ordnance Department’s 81mm Merlin was not in production and the U.S. plan was postponed repeatedly. A major disadvantage of Merlin is that the warhead firing effect (due to caliber limitations) is not commensurate with the cost of the guidance system. In fact, at the front