KAK Industry AR15 LPK Basic Ambidextrous Build Kit. Just the basics from KAK. De-grease ambi selector screw threads and apply blue loctite when assemblying Tq selector screws to 5-7 in/lbs or hand-tight . Features of KAK AR-15 LPK: Bolt Catch Kit Package Contents: KAK Industry AR-15 LPK Basic Ambidextrous Build Kit Bolt Catch Kit Magazine Catch Kit Takedown Pin Detent & Spring Pivot Pin Detent & Spring Buffer Retainer Pin & Spring Ambi Selector Detent & Spring Hammer & Trigger Pins Hammer Trigger & Disconnect Spring KAK Industry AR15-LP-KT-03: AR15 LPK Basic Ambidextrous Build Kit