Brownells - AR-15/M16 UBR Buttstock

Published on November 10, 2011
Duration: 1:56

This video provides an installation guide for the Magpul UBR (Utility Battle Rifle) buttstock for AR-15 and M16 platforms. It highlights the stock's reinforced polymer construction, adjustable length of pull with a preset system, and integrated features like sling mounts and a storage compartment. The guide also notes the necessity of an M4 carbine buffer and action spring for A1/A2 style fixed stock conversions.

Quick Summary

The Magpul UBR (Utility Battle Rifle) stock for AR-15/M16 platforms offers a robust, reinforced polymer construction with seven adjustable length-of-pull positions. Its proprietary preset system allows for rapid adjustments, and it features integrated sling mounts and a lockable storage compartment. Installation on A1/A2 fixed stock rifles requires a separate M4 carbine buffer and action spring.

Chapters

  1. 00:00Introduction to Magpul UBR Stock
  2. 00:03Construction and Durability
  3. 00:12Adjustable Features and Preset System
  4. 00:19Butt Pad and Shoulder Fit
  5. 00:26Length of Pull Adjustment
  6. 00:38Setting Preset Positions
  7. 00:46Streamlined Design and Snag Prevention
  8. 00:54Sling Mounts and Attachment Points
  9. 01:01Storage Compartment Features
  10. 01:15Included Receiver Extension
  11. 01:22Installation Notes for A1/A2 Stocks
  12. 01:31Included Instructions and Guarantee

Frequently Asked Questions

What are the key features of the Magpul UBR buttstock?

The Magpul UBR (Utility Battle Rifle) stock is made of reinforced polymer, offering a solid feel with seven adjustable length-of-pull positions. It includes a proprietary preset system for quick adjustments, minimal snag points, integrated sling mounts, and a lockable storage compartment.

How do you adjust the length of pull on the Magpul UBR stock?

The UBR stock features a proprietary preset system. You pull the release lever to instantly snap the stock open to a position. A machine screw is used to set your preferred preset position, and you press a button and pull the lever again to open it further.

What is required when installing the Magpul UBR on an AR-15 with an A1/A2 fixed stock?

If you are mounting the Magpul UBR on an AR-15 or M16 with an A1/A2 style fixed stock, you must also install an M4 carbine buffer and action spring, which are sold separately. The kit includes a replacement receiver extension.

Does the Magpul UBR stock have storage capabilities?

Yes, the Magpul UBR stock includes a storage compartment suitable for spare batteries, cleaning supplies, or other small items. It has a positive locking door that can be positioned on either side or removed entirely for a skeletonized look.

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