Mil-spec AR15 / M4 Upper Parts Kit (UPK)

Our upper parts kit includes the parts you need to assemble your AR15 Upper Receiver.  Potomac Armory sources these kits from a variety of top tier firearms component companies to bring you the best, made in USA parts.

This is a somewhat generic kit.  If you are looking for a specific kit for an M16A1 or other retro build, you should look for a set specific to your build.

Included:

• Ejection Port Dust Cover
• Ejection Port Hinge Pin
• Ejection Port "C" Clip
• Ejection Port Cover Spring
• Forward Assist Button
• Forward Assist Spring
• Forward Assist Pin