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Spike’s Tactical Crusader AR-15 Pistol Lower Build Kit, SBA5 Stabilizing Brace

Part Number: S-PI-P-LR15-66188
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Spike's Tactical Crusader AR-15 Pistol Lower Build Kit with SBA5 Stabilizing Brace

This is a complete lower build kit designed for AR-15 pistol platforms. It pairs Spike's Tactical Crusader STLS022 lower receiver with a Davidson Defense 31-piece mil-spec lower parts kit, heavy-duty buffer system components, and an SB Tactical SBA5 adjustable stabilizing brace. The kit includes everything needed to complete a functional lower receiver except the stripped lower itself, which you'll need to source separately if building from scratch. If you're assembling an AR-15 pistol, this kit delivers the critical components in one package.

Key Features

  • Spike's Tactical Crusader STLS022 lower receiver with hard coat anodized finish and crusader shield engraving
  • Davidson Defense 31-piece complete mil-spec lower parts kit with curved trigger and full fire control group
  • SB Tactical SBA5 adjustable stabilizing brace with 5-position adjustment and integral QD sling mount
  • Davidson Defense heavy-duty 6-position carbine receiver extension machined from 6061 aluminum
  • Standard AR-15 carbine recoil buffer and spring for reliable cycling
  • Mil-spec compatible components throughout for standard AR-15 platform integration
  • US Tactical mil-spec receiver end plate and Davidson Defense mil-spec castle nut included

Perfect For

  • Builders assembling AR-15 pistol platforms with stabilizing braces
  • Shooters seeking a complete lower assembly solution without sourcing individual components
  • Those prioritizing mil-spec reliability and compatibility across all subsystems
  • Builders who value quality Spike's Tactical receivers paired with proven SB Tactical bracing

Spike's Tactical Crusader Lower Receiver

The Spike's Tactical Crusader STLS022 is a hard coat anodized aluminum lower receiver with distinctive crusader shield and cross engraving. The selector markings feature Latin phrases, "PAX PACIS" and "BELLUM" on one side and "PEACE" and "WAR" on the opposite side. This lower accepts standard AR-15 pattern magazines, fire control components, buffer system extensions, and pistol grips. The multi-caliber marking accommodates various upper assemblies without restriction.

SB Tactical SBA5 Stabilizing Brace Integration

The SBA5 is a 5-position adjustable stabilizing brace designed for mil-spec carbine receiver extensions. It features an adjustable nylon strap, integral ambidextrous QD sling socket, and arm cuff based on the original SB15 design. The brace weighs 9 ounces, extends from 7.5 inches (collapsed) to 10.25 inches (fully extended), and accommodates standard mil-spec buffer tube mounting. The stabilizing strap width is 1 inch, and the cavity depth is 6 inches. This brace is made in the USA and provides multiple adjustment positions for shooter preference and fit.

Complete Lower Parts Kit and Buffer System

The Davidson Defense 31-piece lower parts kit includes a complete mil-spec fire control group with curved trigger, hammer, disconnector, and safety selector. All required pins, detents, springs, magazine catch assembly, bolt catch assembly, and trigger guard are included. The buffer system consists of a Davidson Defense heavy-duty 6-position carbine receiver extension, standard AR-15 carbine recoil buffer (3 ounces), and US-made carbine recoil spring. The receiver end plate and castle nut round out the assembly components.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included.

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 SBA5 Pistol Stabilizing Brace

Brace Brand: SB Tactical

Brace Model: SBA5

Brace Manufacturer Part Number: SBA5X-01-SB

Brace UPC: 699618783490

Brace Type: Adjustable Pistol Stabilizing Brace

Brace Platform Compatibility: Platforms Accepting a Mil-Spec Carbine Receiver Extension

Brace Buffer Tube Compatibility: Mil-Spec Carbine Receiver Extension

Brace Adjustment: 5-Position Adjustable

Brace Mounting Interface: Mil-Spec Carbine Receiver Extension

Brace Color: Black

Brace Strap: Adjustable Nylon Stabilizing Strap

Brace Strap Width: 1"

Brace Sling Mount: Integral Ambidextrous QD Sling Socket

Brace Arm Cuff: Based on the Original SB15 Cuff Design

Brace Weight: 9 oz.

Brace Length: 6.2"

Brace Installed Length Collapsed: 7.5"

Brace Installed Length Extended: 10.25"

Brace Maximum Width: 2.1"

Brace Cavity Depth: 6"

Brace Origin: Made in USA

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