Smith & Wesson AR-15 Customizable Lower Parts Kit. These AR15 Lower Parts from Smith & Wesson provide all the springs pins and detents you'll need for that dream MSR. Add the competition-ready trigger of your choice and use the Smith & Wesson AR15 Lower Parts Kit for the basics. The Smith & Wesson AR15 Customizable Lower Parts Set provides high quality Mil-Spec parts for good support of your platform. Specifications for Smith & Wesson AR-15 Customizable Lower Parts Kit: Manufacturer: Smith & Wesson Color: Black Condition: New Features of Smith & Wesson AR15 Customizable Mil-Spec Lower Parts Kit SN-LPK-CSTLOPK: Perfect choice for custom AR15 build. Provides all minor Mil-Spec parts. Allows addition of common after market upgrades such as triggers and grips. Package Contents: Smith & Wesson AR15 Customizable Lower Parts Kit SN-LPK-CSTLOPK Smith & Wesson 110115: AR-15 Customizable Lower Parts Kit