The CMC AR15 drop in trigger is a self contained easy to install full trigger assembly that drops the standard pull weight to a crisp 3.5lbs. 100% made in America CMC triggers have earned a reputation for being realiable and consistent operation, so much so that supply lines have been scarce and the excellent triggers were hard to come by. CMC has completely retooled and has been able to up production without sacrificing quality. Being a drop in unit, the CMC curved trigger 3.5lb pull AR15 trigger is a breeze to install. Simply take out your existing trigger group and and drop the complete unit into your lower receiver and install the trigger group pins and you have one of the best match grade triggers available ready for a quick function check and then hit the range.