雷管式点火、撞击式点火（英：Percussion lock）或**式点火（英：Cap lock），是一种使用雷管点火来击发火器的设备。雷管中装有非常不稳定的雷汞（英文：Fulminate；化学式：Hg(CON)₂。），雷汞稍受冲击就会爆炸。射击时由扳机敲击雷管，雷管中的雷汞爆炸而引火点燃推进药，子弹再受推进药的爆风推出。此种击发设备的构想在十七世纪就已存在，但是由苏格兰牧师亚历山大·约翰·福赛斯正式发明，并于西元1807年取得专利。

雷管**善许多燧发枪的缺点，例如子弹更易于装填、枪枝更能适应天气等。

The caplock mechanism or percussion lock was the successor of the flintlock mechanism in firearm technology, and used a percussion cap struck by the hammer to set off the main charge, rather than using a piece of flint to strike a steel frizzen.

The rudimentary percussion system was developed by Rev. Alexander John Forsyth as a solution to the problem that birds would startle when smoke puffed from the powder pan of his flintlock shotgun, giving them sufficient warning to escape the shot. His invention of a fulminate-primed firing mechanism deprived the birds of their early warning system, both by avoiding the initial puff of smoke from the flintlock powder pan, as well as shortening the interval between the trigger pull and the shot leaving the muzzle. Forsyth patented his ignition system in 1807. However, it was not until after Forsyth's patents expired that the conventional percussion cap system was developed.