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Spike’s Tactical Crusader AR-15 Lower Build Kit with Magpul BTR Stabilizing Brace

Part Number: S-PI-P-LR15-66189
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Spike's Tactical Crusader AR-15 Pistol Lower Build Kit with Magpul BTR Brace

This is a complete lower build kit designed for AR-15 pistol platforms. It combines Spike's Tactical Crusader stripped lower receiver with a full mil-spec lower parts kit, Davidson Defense buffer system components, and a Magpul BTR adjustable pistol brace. The kit gives you everything needed to assemble a pistol lower receiver except the upper assembly.

Key Features

  • Spike's Tactical Crusader STLS022 lower receiver with hard coat anodized finish
  • Davidson Defense 31-piece mil-spec lower parts kit with complete fire control group
  • Davidson Defense heavy-duty 6-position carbine buffer tube with mil-spec dimensions
  • Standard AR-15 carbine recoil buffer and spring included
  • Magpul BTR adjustable pistol stabilizing brace with spring-loaded adjustment
  • Mil-spec receiver end plate and castle nut
  • Crusader shield engraving with selector markings in English and Latin
  • Multi-caliber lower receiver compatible with standard AR-15 pattern magazines and components

Perfect For

  • Builders creating AR-15 pistol platforms with mil-spec compatibility
  • Shooters wanting a complete lower assembly with quality components pre-assembled
  • Those preferring adjustable brace systems for single-handed operation
  • Customers who value mil-spec standardization and reliability

Crusader Lower Receiver Design

Spike's Tactical Crusader lower features distinctive engraving with a crusader shield logo and selector markings that read "PAX PACIS," "BELLUM," and "DEUS VULT" on one side, with English translations "PEACE," "WAR," and "GOD WILLS IT" on the opposite side. The receiver is machined from aluminum and finished with hard coat anodizing in black. The multi-caliber marking allows use across different AR-15 caliber platforms without receiver-specific limitations.

Magpul BTR Brace System

The Magpul BTR is an adjustable pistol stabilizing brace designed to aid single-handed operation of AR-based pistols. It features a reinforced polymer construction with a lightweight minimalist A-frame profile and narrow vertical stabilizing surface. The brace mounts directly to the mil-spec carbine receiver extension using a spring-loaded dual-spring actuator adjustment system, allowing you to set six different length positions. An integrated rear sling slot provides attachment points for sling systems.

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 anodized black finish. The buffer tube maintains mil-spec diameter specifications, measuring 1.145 inches outer diameter and 1 inch inner diameter. The standard AR-15 carbine recoil buffer weighs 3 ounces with a polymer impact pad, and the made-in-USA carbine recoil spring provides consistent cycling. The receiver end plate and castle nut complete the buffer system assembly.

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: Magpul BTR Pistol Stabilizing Brace

Brace Brand: Magpul

Brace Model: BTR

Brace Manufacturer Part Number: MAG1079

Brace Type: Adjustable Pistol Stabilizing Brace

Brace Platform Compatibility: AR-Pattern Pistols

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

Brace Commercial Buffer Tube Compatibility: No

Brace Proprietary / Pistol Buffer Tube Compatibility: No

Brace Mounting Interface: Mil-Spec Carbine Receiver Extension

Brace Adjustment: Adjustable Along Carbine Receiver Extension

Brace Adjustment System: Spring-Loaded Adjustment Lever

Brace Adjustment Mechanism: Dual-Spring Actuator System

Brace Construction: Reinforced Polymer

Brace Color: Black

Brace Profile: Lightweight Minimalist A-Frame Design

Brace Rear Design: Narrow Vertical Stabilizing Surface

Brace Sling Attachment: Integrated Rear Sling Slot

Brace Design Purpose: Designed to Aid Single-Handed Operation of AR-Based Pistols

Brace Installation Style: Slide-On Carbine Receiver Extension Mount

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