Percussion caps (caplock mechanisms), coming into large services while in the early 19th century, presented a spectacular advancement about flintlocks. Together with the percussion-cap system, the little primer demand of gunpowder used in all preceding firearms was replaced by a very self-contained explosive charge contained in a small brass "cap". https://pantip84815.shotblogs.com/the-fact-about-glock-that-no-one-is-suggesting-42953874