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

Part Number: S-PI-P-LR15-66199
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Spike's Tactical Crusader AR-15 Pistol Lower Build Kit, Polymer AR Brace

This Lower Build Kit centers on the Spike's Tactical Crusader STLS022 lower receiver, machined from aluminum and finished in hard coat black anodizing, carrying the Crusader shield/cross engraving and dual-language selector markings. It's paired with a complete Davidson Defense 31-piece mil-spec Lower Parts Kit, a Davidson Defense pistol receiver extension buffer tube, and a fixed-position polymer pistol stabilizing brace. This item is a serialized component and requires FFL transfer.

Key Features

  • Spike's Tactical Crusader STLS022 lower receiver, aluminum, hard coat anodized black
  • Multi-caliber marking, Crusader shield/cross logo, dual-language selector markings
  • Davidson Defense complete 31-piece mil-spec Lower Parts Kit included
  • Mil-spec A2 pistol grip and standard curved trigger included
  • Davidson Defense aircraft-grade aluminum pistol receiver extension, Type II anodized
  • Polymer AR pistol stabilizing brace in black, fixed/non-adjustable, with ambidextrous QD sling point
  • FFL transfer required

Lower Receiver

The Crusader STLS022 is machined from aluminum and finished in hard coat black anodizing, carrying a multi-caliber marking along with the Crusader shield and cross logo in the magazine well. Its selector carries dual-language markings, reading "PAX PACIS," "BELLUM," and "DEUS VULT" on one side and "PEACE," "WAR," and "GOD WILLS IT" on the opposite side, and it weighs 0.75 pounds. It's built to standard AR-15 pattern magazine, fire control, buffer system, and grip compatibility.

Lower Parts Kit

The included Davidson Defense Lower Parts Kit is a complete, 31-piece mil-spec set covering the full fire control group, including a standard curved mil-spec trigger, mil-spec hammer, disconnector, and mil-spec safety selector, along with the trigger guard, magazine catch assembly and release button, bolt catch assembly, pivot pin, takedown pin, buffer retainer, and the full set of detents and springs. Its components are built from a mix of steel, aluminum, and polymer, finished in Phosphate and anodized coatings. A mil-spec A2 pistol grip in black is included with its grip screw and washer.

Buffer System

The buffer tube is a Davidson Defense pistol receiver extension, precision-machined from aircraft-grade aluminum and finished in Type II anodizing, measuring 7.375 inches long with a 1.24-inch outer diameter, a 1-inch inner diameter, and a weight of 4.5 ounces. Its smooth profile is compatible with standard carbine and pistol-weight buffers, and it's paired here with a 3-ounce standard AR-15 carbine recoil buffer built with a 6061 aluminum body, steel internal weights, and a polymer impact pad, along with a USA-made standard AR-15 carbine recoil spring. A Davidson Defense mil-spec castle nut in black and a US Tactical mil-spec receiver end plate complete the receiver extension hardware.

Brace

This polymer pistol stabilizing brace is a fixed, non-adjustable design in black with a lightweight, skeletonized construction and a reinforced open-frame lower support. It secures to the pistol receiver extension included in this kit and features an integrated, ambidextrous QD sling point compatible with push-button QD sling swivels, along with an additional integrated sling slot.

Follow all manufacturer instructions and safe handling practices.
Ensure compliance with all applicable federal, state, and local laws.
This item must be transferred in accordance with all applicable federal, state, and local laws.

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 AR-15 Pistol Receiver Extension Buffer Tube

Buffer Tube Type: Pistol Receiver Extension

Buffer Tube Application: AR-15 Pistol Builds

Buffer Tube Material: Aircraft-Grade Aluminum

Buffer Tube Construction: Precision-Machined Aluminum

Buffer Tube Finish: Type II Anodized

Buffer Tube Color: Black

Buffer Tube Profile: Smooth Pistol Buffer Tube

Buffer Tube Outer Diameter: 1.24"

Buffer Tube Inner Diameter: 1"

Buffer Tube Length: 7.375"

Buffer Tube Weight: 4.5 oz.

Buffer Tube Buffer Compatibility: Standard Carbine and Pistol-Weight Buffers

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

Brace: Polymer AR Pistol Stabilizing Brace

Brace Type: Fixed Pistol Stabilizing Brace

Brace Platform Compatibility: AR-15 Pistol Configurations

Brace Buffer Tube Compatibility: Pistol Receiver Extension / Buffer Tube

Brace Mounting Style: Receiver Extension Mounted

Brace Configuration: Fixed Position

Brace Adjustment Positions: Fixed / Non-Adjustable

Brace Material: Polymer

Brace Color: Black

Brace Finish: Molded Black Polymer

Brace Rear Profile: Flat End

Brace Body Design: Lightweight Skeletonized Polymer Construction

Brace Support Structure: Reinforced Open-Frame Lower Support

Brace QD Sling Mount: Integrated Ambidextrous QD Sling Point

Brace Sling Compatibility: Push-Button QD Sling Swivels

Brace QD Mount Orientation: Ambidextrous / Left or Right Side

Brace Additional Sling Attachment: Integrated Sling Slot

Brace Retention: Secured to Compatible Pistol Buffer Tube

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