Mk3 Firearms 300 BLK AR15 SBR

Published on January 12, 2018
Duration: 7:18

This video provides a detailed walkthrough of a custom Mk3 Firearms 300 Blackout AR-15 SBR build. The presenter highlights numerous aftermarket components, including an LWRC Ultra Compact Stock, Magpul MOE Grip, Battle Arms 45-degree safety selector, AR Gold trigger, JP Enterprises side charger upper with FMOS bolt carrier system, Knights Armament K-Mod rail, Aimpoint Comp M4S red dot with an ARMS QD mount, and a Battle Comp muzzle device. The presenter emphasizes the quality and functionality of each part, noting that while the build might be 'overbuilt,' it represents a personal ideal for a 300 Blackout SBR.

Quick Summary

This Mk3 Firearms 300 Blackout AR-15 SBR build features an LWRC Ultra Compact Stock, Magpul MOE Grip, Battle Arms 45-degree safety selector, AR Gold trigger, JP Enterprises side charger upper with FMOS bolt carrier, Knights Armament rail and sights, Aimpoint Comp M4S optic with ARMS QD mount, and a Battle Comp muzzle device. The presenter highlights the quality and functionality of these high-end aftermarket components.

Chapters

  1. 00:01Introduction to Mk3 Firearms 300 BLK SBR Build
  2. 00:31Rear Components: Stock, Grip, Safety Selector
  3. 01:01Trigger and Internal Components
  4. 01:31Magazine Release and Magazines
  5. 02:03Upper Receiver: JP Enterprises Side Charger and FMOS
  6. 02:28Knights Armament Sights
  7. 02:56Optics: Aimpoint Comp M4S and ARMS Mount
  8. 03:13Rail System and Muzzle Device
  9. 03:45Right Side Walkthrough
  10. 04:08Modified Ready Mag Details
  11. 04:29BAD Lever and Trigger Aesthetics
  12. 04:44Side Charger Rail Functionality
  13. 05:02ARMS QD Mount Detail
  14. 05:29Skeletonized Ready Mag Showcase
  15. 05:41Charging Mechanism Demonstration
  16. 06:15AR Gold Trigger Appreciation
  17. 06:29Concluding Remarks and Gun Appreciation

Frequently Asked Questions

What caliber is the Mk3 Firearms AR-15 SBR build featured in the video?

The Mk3 Firearms AR-15 SBR build showcased in the video is chambered in 300 Blackout. This caliber is known for its versatility, especially in shorter barrel rifle (SBR) configurations.

What are some of the key aftermarket components on the Mk3 Firearms 300 Blackout AR-15 SBR?

The build features an LWRC Ultra Compact Stock, Magpul MOE Grip, Battle Arms 45-degree safety selector, AR Gold trigger, JP Enterprises side charger upper with FMOS bolt carrier, Knights Armament rail and sights, Aimpoint Comp M4S optic with ARMS QD mount, and a Battle Comp muzzle device.

What is the advantage of the JP Enterprises side charger on this AR-15 build?

The JP Enterprises side charger provides a convenient alternative to the traditional charging handle. It's spring-loaded, returning forward automatically after use, and integrates with the upper receiver for a slicker operation, as noted by the presenter.

What is special about the AR Gold trigger used in this build?

The AR Gold trigger in this build has been re-key treated, giving it a unique bronze and blue contrast instead of the standard gold finish. The presenter highly recommends AR Gold triggers for their quality and performance.

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