Spike Tactical Spikes Tactical Calico Jack Lower, with M4 stock and Buffer tube kit Lower build kit

Spikes Tactical Calico Jack AR-15 Lower Build Kit

This lower build kit combines a Spikes. Tactical. Calico. Jack stripped lower receiver with a complete set of components for AR-15 assembly. The kit includes a mil-spec heavy-duty buffer tube, six-position M4-style buttstock, lower parts kit, and all necessary hardware for lower receiver completion. Everything you need is included except the upper receiver and bolt carrier group.

Key Features

• Spikes Tactical Calico Jack stripped lower receiver with serrated controls
• Mil-spec heavy-duty buffer tube rated for standard AR-15 platforms
• Six-position M4-style carbine buttstock for ergonomic length-of-pull adjustment
• Complete lower parts kit with all springs, pins, and small components
• Black anodized finish throughout all components

Perfect For

• Builders starting their first AR-15 platform rifle
• Shooters upgrading from existing lower receivers to premium components
• Those seeking reliable mil-spec construction for defensive or recreational use
• Builders who prefer quality stripped receivers with matched component kits

Spikes Tactical Quality and Design

The. Calico. Jack lower receiver from. Spikes. Tactical is known for precision machining and tight tolerances. This stripped receiver provides the foundation for a complete lower assembly. The serrated controls and quality finish ensure reliable operation across extended shooting sessions.

Complete Lower Assembly Components

This kit includes everything needed to finish the lower receiver assembly. The mil-spec buffer tube, buttstock, and lower parts kit work together as a matched system. All components are manufactured to standard AR-15 specifications for reliable function and durability.

Mil-Spec Construction Standards

Every component in this kit meets or exceeds mil-spec standards for AR-15 platforms. The heavy-duty buffer tube is designed to handle full-power rifle cartridges. The M4-style buttstock provides comfortable shooting position and allows quick adjustment for different shooters.

What This Kit Does Not Include

Upper receiver not included. Bolt carrier group not included. You will need to source these components separately to complete a functional rifle.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws. Verify all components are compatible before assembly. Use only quality ammunition appropriate for your completed rifle.