Cache.Deals

How To Install The Sabre Builder Set — Upper and QDSM Rail | Palmetto State Armory

Palmetto State Armory
Published on May 14, 2026
Category: Gunsmithing & DIY
Duration: 5:30

This guide details the installation of the Palmetto State Armory Sabre Builder Set, focusing on completing the upper receiver and attaching the QDSM M-LOK rail. It covers critical steps such as torquing the barrel nut to 50 ft-lbs, correctly positioning and torquing the gas block to 30 in-lbs, and securing the handguard with its specific screws to 30 in-lbs. The video emphasizes using the correct tools and torque specifications for a reliable firearm build.

Tags

Sabre Builder Set
AR-15 Upper Receiver
QDSM Rail
M-LOK Rail
Barrel Nut Installation
Gas Block Installation
Muzzle Device Installation
Upper Receiver Assembly
Palmetto State Armory
Firearm Maintenance
DIY Gunsmithing
AR-15 Build
5.56 Build

Quick Summary

To install the Palmetto State Armory Sabre Builder Set upper and QDSM rail, first remove the pre-installed barrel nut. Grease the upper receiver threads, then hand-tighten and torque the barrel nut to 50 ft-lbs. Install the gas block at a 90-degree angle and torque to 30 in-lbs. Finally, attach the handguard and torque its screws to 30 in-lbs.

Chapters

  1. 00:01Introduction to Sabre Builder Set
  2. 00:12Components Included in the Set
  3. 00:27Required Parts and Tools
  4. 01:21Removing Barrel Nut from Handguard
  5. 01:47Preparing the Upper Receiver and Barrel
  6. 02:09Greasing Upper Receiver Threads
  7. 02:29Installing the Barrel Nut
  8. 02:46Torquing the Barrel Nut
  9. 03:03Installing the Gas Block and Tube
  10. 03:37Torquing the Gas Block
  11. 03:44Installing the Muzzle Device
  12. 04:27Installing the Handguard
  13. 04:49Torquing Handguard Screws
  14. 04:56Completing the Upper Receiver

Frequently Asked Questions

What are the essential components included in the Palmetto State Armory Sabre Builder Set?

The Sabre Builder Set typically includes an upper and lower receiver set, along with a rail system. The rail system often comes with the barrel nut already installed, simplifying the initial assembly process.

What is the correct torque specification for the barrel nut when installing an AR-15 upper receiver?

For the Sabre Builder Set, the barrel nut should be torqued to 50 foot-pounds. While mil-spec ranges from 35 to 65 foot-pounds, 50 ft-lbs is the preferred specification for this build to ensure a secure fit.

How should the gas block be installed and torqued on an AR-15 barrel?

The gas block should be slid onto the barrel, ensuring it aligns with the gas port and sits against the barrel's shoulder. It must be at a 90-degree angle and typically torqued to 30 inch-pounds.

What is the recommended torque for the handguard screws on the Sabre QD SM M-LOK rail?

The handguard screws for the Sabre QD SM M-LOK rail should be torqued down to 30 inch-pounds. This ensures the rail is securely attached to the upper receiver.

Related Articles

All Articles →
Palmetto State Armory: From Garage to Industry Disruptor
Industry Analysis18 min read

Palmetto State Armory: From Garage to Industry Disruptor

Find an FFL
Licensed dealers in your area