No MIM here. Luth-AR produces only the best quality, American made parts for the AR platform. All of the parts included in their lower parts kits are investment cast or otherwise machined to Mil-Spec drawings, materials and heat treat. Springs are a combination of 17-4 SST and various Mil-Spec steel wire are used in all of their springs with certification.

• Fits AR-15
• Builder Lower Parts Kit
• No Fire Control/Grip