Compact AR-15 Build | 12.5" Geissele Upper + Blemula Lower Setup

Published on December 5, 2025
Duration: 4:44

This guide details the assembly of a compact AR-15, focusing on a 12.5-inch Geissele upper and a 'Blemula' lower. The build prioritizes maneuverability for 'bump in the night' scenarios, incorporating night vision compatibility with an EOTech on a Unity riser and a PEQ-15. It features a Huxwrx flow-through suppressor and specific furniture choices from B5 Systems. The builder, demonstrating high authority, plans to SBR the firearm for a permanent stock.

Quick Summary

This compact AR-15 build features a 12.5-inch Geissele Super Duty Mod 1 upper and a 'Blemula' lower, optimized for maneuverability and 'bump in the night' scenarios. It includes an EOTech on a Unity Tactical riser for night vision compatibility and a Huxwrx suppressor.

Chapters

  1. 00:00Introduction & Song Rec
  2. 00:33Build Philosophy: Compact 'Bump in the Night'
  3. 01:09Geissele Upper & Blemula Lower
  4. 01:40Furniture & Brace Setup
  5. 02:07NVG-Ready Optics: EOTech & Unity
  6. 02:54Tactical Light & Laser (PEQ-15)
  7. 03:29Huxwrx Suppressor Installation

Frequently Asked Questions

What is the primary purpose of this compact AR-15 build?

The primary goal of this AR-15 build is to create a compact 'bump in the night' firearm. It prioritizes maneuverability while maintaining sufficient velocity and incorporating features for low-light and night vision operations.

What barrel length was chosen and why?

A 12.5-inch barrel was selected. This length offers a compromise between the increased velocity of longer barrels and the enhanced maneuverability of shorter barrels, making it ideal for a compact, tactical platform.

How is this AR-15 configured for night vision use?

The build features an EOTech optic mounted on a Unity Tactical riser, which positions the sight at a height suitable for passive aiming with night vision devices. A PEQ-15 laser is also included for IR aiming capabilities.

What suppressor is used on this build?

A Huxwrx suppressor is utilized, attached via a KeyMo mount. This suppressor is noted for its flow-through technology, which aims to mitigate gas blowback.

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