M&P Accessories 110115 Customizable Lower Parts Kit AR-15

The M&P Customizable lower parts kit is the ideal choice if you want to build a custom AR-15. This kit provides all the minor parts generally used in an AR-15 build but allows the flexibility to add popular common aftermarket upgrades. The kit includes a bolt catch plunger roll pin and spring; buffer retainer and spring; hammer pin; magazine catch button and spring; pivot pin; pin detent and more.