Spike's Tactical PHU Skull Pistol Lower Build Kit, SBA4 Adjustable Stabilizing Brace

Spike's Tactical PHU Skull Pistol Lower Build Kit, SB Tactical SBA4 Adjustable 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 Mil-Spec heavy-duty AR-15 6-position carbine buffer tube in black anodized aluminum, 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 SBA4 adjustable pistol stabilizing brace in black reinforced polymer with a flexible elastomer rear support, a 5-position adjustable length of pull secured by a positive lock adjustment lever, an integrated adjustable hook-and-loop stabilizing strap, integrated ambidextrous QD sling sockets, and an enhanced integral cheek surface 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
• Mil-Spec heavy-duty AR-15 6-position carbine buffer tube, aluminum, black anodized
• 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 SBA4 adjustable pistol stabilizing brace, black, reinforced polymer with flexible elastomer rear support, 5-position adjustable, positive lock adjustment lever, integrated adjustable hook-and-loop stabilizing strap, integrated ambidextrous QD sling sockets, enhanced integral cheek surface, Mil-Spec carbine 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 SBA4 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 SBA4 brace with a positive lock adjustment lever and integrated ambidextrous QD sling sockets covered in one package
• Builders who want a distinctively marked Spike's Tactical PHU Skull lower receiver with RDIAS compatibility and an SB Tactical SBA4 adjustable pistol 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 Mil-Spec heavy-duty AR-15 6-position carbine buffer tube in black anodized aluminum, standard carbine buffer at 3 oz., and standard AR-15 carbine recoil spring made in the USA form the complete buffer system at the rear of the lower. 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 buffer tube down cleanly at the rear of the receiver. The SB Tactical SBA4 adjustable pistol stabilizing brace in black reinforced polymer with a flexible elastomer rear support fits over the Mil-Spec 6-position carbine buffer tube and closes out the rear end with a 5-position adjustable length of pull secured by a positive lock adjustment lever, an integrated adjustable hook-and-loop stabilizing strap for arm support, integrated ambidextrous QD sling sockets for quick-detach sling attachment on both sides of the brace body, and an enhanced integral cheek surface. The all-black finish across the lower receiver, pistol grip, and SBA4 brace gives this lower kit a clean and consistent exterior throughout.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.