As AR rifles have risen in popularity in recent years, drop-in trigger systems have become more popular than ever--and you don't need to be a gunsmith! Ruger for the first time is offering drop-in triggers for two popular rifles in its lineup--the 10/22 semiauto .22 rimfire and its version of the centerfire AR platform--the SR556. In a matter of minutes you can drop-in either trigger systems, and you'll find the simplicity of the design impressive. No need to spend hours at the bench or studying gunsmithing books--and you get an improved trigger and at a cost that won't bust your budget.