Spike's Tactical PHU Skull Pistol Lower Build Kit, Gauntlet Arms FDE Polymer Stabilizing Brace

Spike's Tactical PHU Skull Pistol Lower Build Kit, Gauntlet Arms FDE Polymer Stabilizing Brace

This is a Spike's Tactical Pipe Hitters Union Skull AR-15 pistol lower build kit built around a Spike's Tactical STLS023 PHU Skull forged 7075-T6 aluminum lower receiver with a MIL-A-8625F Type III Class 2 hard coat anodized black finish, a low shelf trigger pocket with RDIAS compatibility, Spike's Tactical Apopka FL USA roll mark, a Pipe Hitters Union Skull logo with crossbones and MOD PHU CAL MULTI engraving on the magazine well, and ambidextrous Safe and Fire pictogram style selector markings. The complete Mil-Spec AR-15 lower parts kit covers the full internal lower component group with a Mil-Spec single-stage trigger, Mil-Spec safety selector, standard Mil-Spec magazine catch, bolt catch, pivot pin, and takedown pins. An A2 style black textured polymer pistol grip covers the grip interface. The buffer system consists of a heavy-duty black anodized aluminum smooth pistol receiver extension, a standard carbine buffer at 3 oz. in black anodized aluminum, and a standard AR-15 carbine recoil spring made in the USA. A US Tactical AR-15 and M16 Mil-Spec steel receiver end plate in black and an AR-15 Mil-Spec carbine steel castle nut in black complete the rear hardware. A Gauntlet Arms FDE reinforced polymer stabilizing brace with a lightweight design, an angled stabilizing support with reinforced polymer geometry, and an integrated sling slot closes out the rear end.

Key Features

• Spike's Tactical STLS023 PHU Skull forged 7075-T6 aluminum lower receiver, MIL-A-8625F Type III Class 2 hard coat anodized black
• Low shelf trigger pocket, RDIAS compatible
• Pipe Hitters Union Skull logo with crossbones and MOD PHU CAL MULTI engraving on magazine well
• Ambidextrous Safe and Fire pictogram style selector markings
• Spike's Tactical Apopka FL USA roll mark
• Compatible with 5.56 NATO, .223 Remington, .300 AAC Blackout, 9mm, and other AR-15 compatible calibers
• Complete Mil-Spec AR-15 lower parts kit with Mil-Spec single-stage trigger, Mil-Spec safety selector, standard Mil-Spec magazine catch, bolt catch, pivot pin, and takedown pins
• A2 style black textured polymer pistol grip
• Heavy-duty smooth pistol receiver extension, aluminum, black anodized, AR-15 pistol buffer system compatible
• Standard carbine buffer, 3 oz., aluminum, black anodized
• Standard AR-15 carbine recoil spring, made in the USA
• US Tactical AR-15 and M16 Mil-Spec steel receiver end plate, black
• AR-15 Mil-Spec carbine steel castle nut, black
• Gauntlet Arms polymer stabilizing brace, FDE, reinforced polymer, lightweight design, fixed, angled stabilizing support with reinforced polymer geometry, integrated sling slot, smooth pistol buffer tube compatible

Perfect For

• AR-15 pistol builders sourcing a complete lower build kit on the Spike's Tactical PHU Skull receiver with a Gauntlet Arms FDE polymer stabilizing brace included
• Shooters pairing this kit with an existing upper assembly who want the PHU Skull lower receiver with a complete Mil-Spec lower parts kit and a lightweight FDE brace with an integrated sling slot covered in one package
• Builders who want a distinctively marked black Spike's Tactical PHU Skull lower receiver paired with a Gauntlet Arms FDE brace for a two-tone black and FDE exterior on the lower side

Lower Receiver

The Spike's Tactical STLS023 PHU Skull lower receiver is precision forged from 7075-T6 aluminum and finished to MIL-A-8625F Type III Class 2 hard coat anodize standards in black. The low shelf trigger pocket is RDIAS compatible. The magazine well carries the Pipe Hitters Union Skull logo with crossbones and a MOD PHU CAL MULTI engraving, and the ambidextrous Safe and Fire pictogram style selector markings appear on both sides of the receiver. The Spike's Tactical Apopka FL USA roll mark is present on the receiver body. The receiver accepts standard Mil-Spec AR-15 components and is compatible with 5.56 NATO, .223 Remington, .300 AAC Blackout, 9mm, and other AR-15 compatible calibers.

Lower Parts Kit and Buffer System

The complete Mil-Spec AR-15 lower parts kit covers the full internal lower component group, including the Mil-Spec single-stage trigger, Mil-Spec safety selector, standard Mil-Spec magazine catch, bolt catch, pivot pin, and takedown pins. An A2 style black textured polymer pistol grip covers the grip interface. The heavy-duty black anodized aluminum smooth pistol receiver extension houses the buffer system at the rear of the lower, matched to the AR-15 pistol platform. The standard carbine buffer at 3 oz. in black anodized aluminum and standard AR-15 carbine recoil spring made in the USA sit within the pistol receiver extension and complete the rear buffer hardware. The US Tactical AR-15 and M16 Mil-Spec steel receiver end plate in black and AR-15 Mil-Spec carbine steel castle nut in black lock the pistol receiver extension down cleanly at the rear of the receiver. The Gauntlet Arms FDE reinforced polymer stabilizing brace mounts directly onto the smooth pistol receiver extension and closes out the rear end with a lightweight design, an angled stabilizing support with reinforced polymer geometry for bracing stability, and an integrated sling slot for sling attachment without additional hardware. The FDE color of the Gauntlet Arms brace provides a contrasting finish against the black anodized lower receiver, giving the lower build a two-tone black and FDE exterior from receiver to brace.

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