Spike's Tactical Calico Jack Pistol Lower Build Kit, SBM4 Stabilizing Brace

Spike's Tactical Calico Jack Pistol Lower Build Kit, SB Tactical SBM4 Pistol Stabilizing Brace

This is a Spike's Tactical Calico Jack AR-15 pistol lower build kit built around a Spike's Tactical Calico Jack forged 7075-T6 aluminum lower receiver with a MIL-A-8625F Type III Class 2 hard coat anodized black finish, a Mil-Spec pattern, multi-caliber markings, and Parley, Argg, and Plunder selector markings engraved on both sides of the receiver. The complete Mil-Spec AR-15 lower parts kit covers the full internal lower component group. A Mil-Spec A2 style pistol grip in black covers the grip interface. The buffer system consists of a heavy-duty hardcoat anodized black aluminum pistol buffer tube for AR-15 and AR style pistols, a standard AR-15 carbine recoil buffer at 3 oz., and a standard AR-15 carbine recoil spring made in the USA. A US Tactical AR-15 and M16 Mil-Spec receiver end plate and an AR-15 carbine castle nut complete the rear hardware. An SB Tactical SBM4 pistol stabilizing brace in black reinforced polymer with a flexible elastomer cuff, a skeletonized design, and an adjustable hook-and-loop stabilizing strap closes out the rear end.

Key Features

• Spike's Tactical Calico Jack forged 7075-T6 aluminum lower receiver, MIL-A-8625F Type III Class 2 hard coat anodized black
• Mil-Spec pattern, multi-caliber markings
• Parley, Argg, and Plunder selector markings engraved on both sides
• Complete Mil-Spec AR-15 lower parts kit with Mil-Spec A2 style pistol grip, black
• Heavy-duty pistol buffer tube, aluminum, hardcoat anodized black, AR-15 and AR style pistol compatible
• Standard AR-15 carbine recoil buffer, 3 oz.
• Standard AR-15 carbine recoil spring, made in the USA
• US Tactical AR-15 and M16 Mil-Spec receiver end plate
• AR-15 carbine castle nut
• SB Tactical SBM4 pistol stabilizing brace, black, reinforced polymer with flexible elastomer cuff, skeletonized design, fixed, adjustable hook-and-loop stabilizing strap, pistol buffer tube compatible

Perfect For

• AR-15 pistol builders sourcing a complete lower build kit on the Spike's Tactical Calico Jack receiver with an SB Tactical SBM4 brace included
• Shooters pairing this kit with an existing upper assembly who want a Calico Jack lower and a lightweight SBM4 brace with an adjustable hook-and-loop stabilizing strap covered in one package
• Builders who want a distinctively marked Spike's Tactical lower receiver with a complete pistol buffer system and an SBM4 fixed pistol stabilizing brace in one lower kit

Lower Receiver

The Spike's Tactical Calico Jack lower receiver is a forged 7075-T6 aluminum receiver finished to MIL-A-8625F Type III Class 2 hard coat anodize standards in black. The Mil-Spec pattern receiver carries multi-caliber markings and the Calico Jack-specific selector markings of Parley, Argg, and Plunder engraved on both sides of the receiver body. The receiver accepts standard Mil-Spec AR-15 components throughout the lower.

Lower Parts Kit and Buffer System

The complete Mil-Spec AR-15 lower parts kit covers the full internal lower component group, including the fire control group, magazine catch, bolt catch, and all associated pins and springs. A Mil-Spec A2 style pistol grip in black covers the grip interface. The heavy-duty hardcoat anodized black aluminum pistol buffer tube houses the buffer system at the rear of the lower, matched to the AR-15 and AR style pistol platform. The standard AR-15 carbine recoil buffer at 3 oz. and standard AR-15 carbine recoil spring made in the USA sit within the pistol buffer tube and complete the rear buffer hardware. The US Tactical AR-15 and M16 Mil-Spec receiver end plate and AR-15 carbine castle nut lock the buffer tube down cleanly at the rear of the receiver. The SB Tactical SBM4 pistol stabilizing brace in black reinforced polymer with a flexible elastomer cuff mounts directly onto the pistol buffer tube and closes out the rear end with a fixed skeletonized profile and an adjustable hook-and-loop stabilizing strap for arm support. The all-black finish across both the lower receiver and the SBM4 brace gives this lower kit a clean and consistent exterior from receiver to brace.

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