Rise Armament makes some of the best and most affordable drop in triggers available. Rise drop in triggers make upgrading your AR easy and affordable. A great trigger upgrade is something you will notice both in feel and accuracy and are one of the best upgrades you can do.
MMC Combos RISE Armament Blitz Elite Performance Trigger, Anti-Walk Pins, Black + KAK AR-15 "Lite" Lower Parts Kit
MMC Combos AR-15 Trigger Upgrade Kit Including Rise Armament Curved Trigger + CMMG Lower Parts Kit + Magpul MOE+ Grip