Experience showed the Germans that the average submachine gun was too muscular for reliable accuracy within a thousand feet, which made it sketchy in close combat situations.

德国人的经验表明，一般的冲锋枪太过笨重，一千英尺内无法保证精准度，不利于近距离战斗。

During early 1980s the basic design was improved with the introduction of the Model 12s submachine gun, which had improved safety arrangement and several other minor changes.

在基本设计与示范12秒冲锋枪，这是有助于提高安全性的安排和其他一些小的改动80年代初引入改善。