Premium 80% Lower - Fire/Safe Marked - Billet - Assembly Kit

Our updated billet AR-15 billet 80% lower with a quality lower build kit.

Grab a quality, mil-spec lower assembly kit built to pair with your new 80% lower and save! This kit contains all components required to assemble the lower half of your custom AR-15 build in one kit. Just finish the lower, put it together, and slap on the upper.

Our Premium Billet 80% Lower has been redesigned with easier assembly in mind. This receiver has been enhanced with a threaded bolt catch release hole and threaded rear takedown detent hole. No more roll pins and loose springs!

These enhancements allow for a quicker, simpler install of your lower parts kit with fewer tools required.

100% mil-spec fitment ensures this lower works with all standard AR-15 parts, including all upper assemblies, buffer tubes, pistol grips, magazines, mag catch assemblies, and internal fire control components like the hammer, trigger, safety, and pins.

Billet 80% Lower Specifications

• Compatibility: 5.56/.223, 300 BLK, 6.5 Grendel
• Construction: Billet 6061-T6 Aluminum
• Finish: Type III Hardcoat Anodizing
• Color: Matte Black
• Fitment: 100% Mil-Spec
• Fire/Safe Engraving: Yes
• Features: Broached Magwell, threaded bolt catch and rear takedown detent holes, integrated heavy-duty trigger guard
• 100% Made in the USA

Lower Build Kit Specifications

• Includes full lower parts kit
• Includes mil-spec pistol grip
• Includes mil-spec buffer assembly
• Buffer weight: 3.0 ounces
• Buttstock: Mil-spec M4, six positions
• Buffer tube: mil-spec threads

Need Help Assembling Your Lower and Build Kit?

Once you've cut and drill your lower, follow our step-by-step picture guide to install your lower parts kit.

Not sure which parts to pick? Read our Ultimate Guide on How to Build an AR-15.

New to building custom guns? Read our FAQ: What Is An 80% Lower?