Sota Arms John Doe Rifle Lower Build Kit, Mil-Spec Heavy-Duty Carbine 6-Position Buffer Tube

Sota Arms John Doe 15 AR-15 Rifle Lower Build Kit

The John Doe 15 Lower Build Kit from Sota Arms is a complete lower completion package built around a CNC machined billet aluminum lower receiver finished in Type III hard coat black anodize. The receiver is compatible with Mil-Spec AR-15 upper receivers and includes an integrated Magpul style trigger guard. This kit covers the core lower component set, including a complete Mil-Spec lower parts kit with a Mil-Spec A2 style polymer pistol grip, along with a full buffer system consisting of a Mil-Spec heavy duty 6-position carbine buffer tube, a 3 oz standard carbine buffer, and a standard carbine recoil spring. A receiver end plate and castle nut round out the rear support hardware.

Key Features

• John Doe 15 CNC machined billet aluminum lower receiver
• Type III hard coat black anodized finish
• Integrated Magpul style trigger guard
• ATF minimum required markings only, no logo
• Drilled and tapped for 6-32 receiver tension set screw
• Rear takedown detent located underneath the pistol grip
• Complete Mil-Spec AR-15 lower parts kit
• Mil-Spec A2 style polymer pistol grip, black
• Mil-Spec heavy duty 6-position carbine buffer tube
• 3 oz standard carbine buffer
• Standard AR-15 carbine recoil spring
• US Tactical Mil-Spec receiver end plate
• Mil-Spec carbine castle nut

Perfect For

• Builders sourcing a complete lower build kit around a Mil-Spec AR-15 upper
• Shooters wanting a billet receiver design with a clean, no logo finish
• Builders who want the lower parts kit and buffer system covered in one package

John Doe 15 Billet Receiver

The John Doe 15 receiver is CNC machined from billet aluminum and finished in Type III hard coat black anodize. It carries no logo and includes only the ATF minimum required markings. The receiver includes an integrated Magpul style trigger guard and is compatible with Mil-Spec AR-15 upper receivers. It is drilled and tapped for a 6-32 tension set screw, though the set screw itself is not included. The rear takedown detent is located underneath the pistol grip for a simplified profile.

Lower Parts Kit and Grip

The included lower parts kit covers the internal small parts needed for lower receiver completion, built to Mil-Spec standards. A Mil-Spec A2 style polymer pistol grip in black is included as part of the lower parts kit. These components address the internal lower receiver parts group and exterior grip interface together as a single included set.

Buffer System Components

The buffer system in this kit consists of a Mil-Spec heavy duty 6-position carbine buffer tube, a 3 oz standard carbine buffer, and a standard carbine recoil spring made in the USA. A US Tactical Mil-Spec receiver end plate and a Mil-Spec carbine castle nut complete the rear hardware set. These components cover the core rear support hardware for the lower side of this AR-15 build.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Set screw not included. Made in the USA.