During the early part of the 16th century the arquebus's successor the musket starter to appear in Spain. The musket was considered the largest and most powerful gun that a single soldier could easily operate. Most muskets were five to six feet long, weighed around twenty pounds and required the use of a forked rest to support the gun during firing. The simple serpentine of the arquebus was replaced with the more advanced sear lock which used a spring operated trigger or lever to lower the slow match into the priming pan. The operation of this lock can be seen in the animation below.