Schmid Inside SI Ambi LPK Minus FCG Lower Parts Kit Black. It contains a semi-auto safety selector plus the bolt catch with roll pin (3/32 x .5) plunger and spring; magazine catch spring and steel magazine release button; trigger guard assembly with roll pin (.132 x .625); buffer retainer pin and spring; A2 grip with grip screw and lock washer; takedown pin and pivot pin each with detent and spring; and safety detent with spring. Specifications for Schmid Inside SI Ambi LPK Minus FCG Lower Parts Kit: Manufacturer: Schmid Inside Color: Black Caliber: 5.56x45mm NATO Gun Make: AR Platform Gun Model: AR-15 Complete lower parts kit less fire control group (trigger hammer and disconnect not included) Standard semi-auto safety selector A2-style pistol grip with grip screw and lock washer Steel magazine release button Trigger guard assembly included Compatible with AR-15 platform lower receivers Package Contents: Schmid Inside SI Ambi LPK Minus FCG Lower Parts Kit AMBI Safety Safety Detent and Spring Bolt Catch and Roll Pin Bolt Catch Plunger and Spring Mag Catch Assembly Steel Magazine Release Button Magazine Catch Spring Trigger Guard Assembly and Roll Pin Buffer Retainer Pin and Spring Grip Grip Screw and Washer Take Down Pin Take Down Detent and Spring Pivot Pin Pivot Pin Detent and Spring Schmid Inside SI-LPK-AMBI-1: SI Ambi LPK Minus FCG Lower Parts Kit Black