Rise Armament 12003 AR-15 Lower Parts Kit | No Trigger

The Rise Armament 12003 Lower Parts Kit is a 20-piece kit intended to assemble or service an AR-15 lower receiver and does not include a trigger or complete fire control group. The kit supplies common mil-spec components and is finished for corrosion resistance. Typical uses include range/maintenance builds and competition or precision-focused lower assembly work.

Product Specifications

• The manufacturer is Rise Armament.
• The manufacturer part number is 12003.
• The kit is a 20-piece lower parts kit that does not include a trigger or fire control group.
• The finish applied to many parts is black phosphate for corrosion resistance.
• The UPC is 851046006866.
• Most mil-spec components in the kit are made of 8620 steel.
• The Safety Detent Pin and Takedown/Pivot Pin Detents are made of yellow zinc.
• The kit includes standard trigger pins and a safety selector but does not include a trigger assembly.
• The listed overall dimensions are 0.85 x 4.00 x 7.05 inches.
• The listed height is 0.8500 inches.
• The listed length is 7.0500 inches.
• The listed width is 4.0000 inches.
• The product type is specified as a Lower Parts Kit.
• The kit contains components such as a bolt catch, magazine catch, buffer retention pin, takedown and pivot pins, and assorted springs and detents.

This Rise Armament 12003 kit supplies the essential parts needed to build or refresh an AR-15 lower with durable materials and corrosion-resistant finishes suitable for routine range use and competitive builds. Its contents are organized to simplify lower assembly and parts replacement while matching common mil-spec form and fit.

Users have reported that the kit provides high-quality components and precise manufacturing, and owners have noted its durability and reliability.