The Strike Industries AR-15 Enhanced Lower Receiver Parts Kit with Trigger Group offers a convenient upgrade package for the AR15 for those looking for a complete Strike Industries solution for new builds, or to update their plain jane AR. This kit includes all the basics that you will need to build out your AR (minus grip), but with Strike Industries Enhanced lower parts where applicable. This complete kit includes the fire control group which offers a crisp 5.5-8.5 lb pull, with unmatched smoothness for mil-spec style AR15 triggers. Longitudinally ground and polished sear engagement surfaces coupled with precision cut sear angle equate a vastly improved trigger feel without sacrificing safety or reliability. Package includes:Enhanced Bolt Catch - features improved grip surfaces and anglesStrike Magazine CatchStrike Magazine Catch Button Enhanced Pivot Pin - longer of the two large pinsEnhanced Takedown Pin - smaller of the two large pinsSI Selector Lever - 2 included in packageSI...