Spike's Tactical PHU Skull Pistol Lower Build Kit, SBM4 Stabilizing Brace

Spike's Tactical PHU Skull Pistol Lower Build Kit, SB Tactical SBM4 Pistol 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 pistol buffer tube, a standard carbine 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 steel receiver end plate in black and an AR-15 Mil-Spec carbine steel castle nut in black complete the rear hardware. An SB Tactical SBM4 pistol stabilizing brace in black reinforced polymer with a flexible elastomer arm cuff 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 pistol buffer tube, aluminum, black anodized, pistol stabilizing brace compatible
• Standard carbine buffer, 3 oz.
• 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
• SB Tactical SBM4 pistol stabilizing brace, black, reinforced polymer with flexible elastomer arm cuff, fixed, 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 an SB Tactical SBM4 fixed pistol 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 an SBM4 brace with a flexible elastomer arm cuff covered in one package
• Builders who want a distinctively marked Spike's Tactical PHU Skull lower receiver with RDIAS compatibility and an SB Tactical SBM4 fixed pistol stabilizing brace in one complete pistol lower kit

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 pistol buffer tube houses the buffer system at the rear of the lower, matched to the AR-15 pistol platform. The standard carbine 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 steel receiver end plate in black and AR-15 Mil-Spec carbine steel castle nut in black lock the pistol 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 arm cuff mounts directly onto the pistol buffer tube and closes out the rear end with a fixed profile that wraps the brace body around the tube with the flexible elastomer arm cuff for forearm contact and support. The all-black finish across the lower receiver, pistol grip, and SBM4 brace gives this lower kit a clean and consistent exterior throughout.

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