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Spike’s Tactical Crusader AR-15 Lower Build Kit, SBA4 Adjustable Stabilizing Brace

Part Number: S-PI-P-LR15-66190
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On sale $264.99 $199.99
Retail Price:$264.99
Your Savings:$65.00(25%)
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Spike's Tactical Crusader AR-15 Pistol Lower Build Kit with SBA4 Brace

The Spike's Tactical Crusader AR-15 pistol lower build kit combines a precision-machined aluminum lower receiver with a complete mil-spec parts package and SB Tactical SBA4 adjustable stabilizing brace. This kit gives you a fully functional lower assembly ready to pair with any AR-15 upper, delivering professional-grade construction with distinctive Crusader branding and selector markings that set it apart from standard mil-spec options.

Key Features

  • Spike's Tactical Crusader STLS022 lower receiver in hard coat anodized black aluminum
  • Davidson Defense 31-piece mil-spec lower parts kit with complete fire control group
  • SB Tactical SBA4 adjustable stabilizing brace with 5-position adjustment and QD sling socket
  • Heavy-duty 6-position carbine receiver extension with standard buffer and recoil spring
  • Mil-spec A2 pistol grip and US Tactical receiver end plate included
  • Crusader Shield engraving with "PAX PACIS," "BELLUM," and "DEUS VULT" selector markings

Perfect For

  • Builders looking for a complete pistol lower assembly with premium components
  • Shooters who want a distinctive lower receiver with quality branding
  • Pistol platform builds requiring mil-spec compatibility and reliability
  • Those seeking an adjustable brace solution with integrated QD mounting

Spike's Tactical Crusader Receiver

The Crusader STLS022 lower receiver is precision-machined from 6061 aluminum and finished with hard coat anodize for durability. The receiver features the distinctive Crusader Shield logo and Latin selector markings that make this lower instantly recognizable. Multi-caliber markings support standard AR-15 pattern magazines and fire control components, giving you platform flexibility for future builds.

SB Tactical SBA4 Stabilizing Brace Integration

The SBA4 brace mounts directly to the included heavy-duty carbine receiver extension and offers 5-position adjustment to customize length of pull. The reinforced polymer construction features an integrated ambidextrous QD sling socket, adjustable nylon strap, and split stabilizing design. The brace maintains mil-spec compatibility while delivering the adjustability serious builders expect.

Complete Mil-Spec Lower Parts Kit

The 31-piece Davidson Defense lower parts kit includes everything needed to complete your lower receiver: standard curved mil-spec trigger and hammer, disconnector, safety selector, magazine catch assembly, bolt catch assembly, pivot and takedown pins, trigger guard, buffer retainer, and all required springs and detents. All components are finished in phosphate or anodized coating for corrosion resistance.

Buffer System and Receiver Extension

The kit includes a Davidson Defense heavy-duty 6-position carbine receiver extension machined from 6061 aluminum with type II anodize finish. The standard AR-15 carbine recoil buffer and spring provide reliable cycling, and the US Tactical mil-spec receiver end plate and Davidson Defense castle nut complete the assembly. This combination ensures compatibility with any standard AR-15 upper receiver.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. Verify brace legality in your jurisdiction before purchase.

Specifications

Platform: AR-15

Lower Receiver: Spike’s Tactical Crusader STLS022 Lower Receiver

Lower Receiver Model: Crusader STLS022

Lower Receiver Caliber Marking: Multi-Caliber

Lower Receiver Material: Aluminum

Lower Receiver Finish: Hard Coat Anodized

Lower Receiver Color: Black

Lower Receiver Magazine Compatibility: Standard AR-15 Pattern Magazines

Lower Receiver Fire Control Compatibility: Standard AR-15 Pattern Components

Lower Receiver Buffer System Compatibility: Standard AR-15 Receiver Extension Components

Lower Receiver Grip Compatibility: Standard AR-15 Pistol Grips

Lower Receiver Engraving: Crusader Shield / Cross Logo

Lower Receiver Selector Markings: “PAX PACIS,” “BELLUM,” and “DEUS VULT”

Opposite-Side Selector Markings: “PEACE,” “WAR,” and “GOD WILLS IT”

Lower Receiver Manufacturer: Spike’s Tactical

Manufacturer Part Number: STLS022

Lower Receiver UPC: 855319005075

Lower Receiver Weight: 0.75 lb

Lower Parts Kit: Davidson Defense Complete Mil-Spec AR-15 Lower Parts Kit

Lower Parts Kit Piece Count: 31 Pieces

Fire Control Group: Complete Mil-Spec Fire Control Group

Trigger: Standard Curved Mil-Spec Trigger

Hammer: Mil-Spec Hammer

Disconnector: Included

Safety Selector: Mil-Spec Safety Selector

Trigger & Hammer Pins: Included

Magazine Catch Assembly: Included

Magazine Release Button: Included

Bolt Catch Assembly: Included

Pivot Pin: Included

Takedown Pin: Included

Trigger Guard: Included

Buffer Retainer: Included

Detents: Safety Selector, Pivot Pin, and Takedown Pin Detents Included

Springs: Complete Lower Parts Kit Spring Set Included

Pistol Grip: Mil-Spec A2 Pistol Grip

Pistol Grip Color: Black

Grip Hardware: Grip Screw and Washer Included

Lower Parts Kit Material Composition: Steel, Aluminum, and Polymer

Lower Parts Kit Finishes: Phosphate and Anodized

Buffer Tube: Davidson Defense Heavy-Duty 6-Position Carbine Receiver Extension

Buffer Tube Type: Mil-Spec Carbine

Buffer Tube Material: 6061 Aluminum

Buffer Tube Construction: Heavy-Duty Machined Aluminum

Buffer Tube Finish: Type II Anodized

Buffer Tube Color: Black

Buffer Tube Profile: Mil-Spec Diameter Carbine Receiver Extension

Buffer Tube Adjustment Positions: 6

Buffer Tube Outer Diameter: 1.145"

Buffer Tube Inner Diameter: 1"

Buffer Tube Length: 7.15"

Buffer Tube Weight: 3.8 oz.

Buffer Tube Brace Compatibility: Mil-Spec Diameter Adjustable Stabilizing Braces

Buffer: Standard AR-15 Carbine Recoil Buffer

Buffer Weight: 3 oz.

Buffer Body Material: 6061 Aluminum

Buffer Internal Weights: Steel

Buffer Tip: Polymer Impact Pad

Buffer Spring: Standard AR-15 Carbine Recoil Spring

Buffer Spring Origin: Made in USA

Receiver End Plate: US Tactical AR-15/M16 Mil-Spec Receiver End Plate

Castle Nut: Davidson Defense AR-15 Mil-Spec Carbine Castle Nut

Castle Nut Color: Black

Pistol Brace: SB Tactical SBA4 Adjustable Pistol Stabilizing Brace

Brace Brand: SB Tactical

Brace Model: SBA4

Brace Type: Adjustable Pistol Stabilizing Brace

Brace Platform Compatibility: AR-Pattern Platforms Using a Mil-Spec Carbine Receiver Extension

Brace Buffer Tube Compatibility: Standard Mil-Spec Carbine Buffer Tube

Brace Adjustment: 5-Position Adjustable

Brace Mounting Interface: Mil-Spec Carbine Receiver Extension

Brace Attachment Style: Slide-On Adjustable Carbine-Style Mount

Brace Material: High-Strength Impact-Resistant Polymer

Brace Color: Black

Brace Finish: Matte Black

Brace Style: Reinforced Carbine-Style Stabilizing Brace

Brace Stabilizing Strap: Adjustable Nylon Strap

Brace Strap Color: Black

Brace QD Sling Mount: Integrated Ambidextrous QD Sling Socket

Brace Sling Compatibility: Push-Button QD Sling Swivels

Brace Profile: Reinforced, Adjustable Carbine-Style Design

Brace Construction: Reinforced Polymer Construction

Brace Adjustment Control: Integrated Adjustment Lever

Brace Rear Design: Split Stabilizing Design with Adjustable Strap

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