The New Frontier Armory LW-4 polymer lower is the strongest polymer based lower receiver ever made. It is manufactured using Nylon 6, a glass filled and chemically coupled nylon polymer for maximum durability and strength.This will be the perfect lower for your AR-15 build to make it extremely light and incredibly durable. We have a lifetime warranty on our lowers to back that up.

• Extremely durable with glass filled nylon-6 reinforced polymer construction
• Accepts all MIL-SPEC and standard AR-15 parts and upper receivers 
• Utilizes a square nut that seats in the pistol grip boss to provide a stronger, more durable
• attachment of the pistol grip (screw, washer and nut included!)
• Lifetime warranty on all our lowers
• Half the weight of an aluminum lower
• Weighs only 4.15 ounces