Olympic Arms MPR 308 15 Rifle Technical Review

Published on September 2, 2018
Duration: 15:34

This technical review of the Olympic Arms MPR 308-AR highlights its unique convertible design, allowing a switch between .308 Winchester and standard AR-15 (5.56 NATO) upper receivers. The review details the proprietary lower receiver's dual lug system and the conversion process, emphasizing the use of a specialized buffer and bolt carrier group for .308 operation. While the 5.56 conversion utilizes standard AR-15 components, the .308 configuration features a proprietary single-column steel magazine and a modified bolt carrier group.

Quick Summary

The Olympic Arms MPR 308-AR is a convertible rifle designed for modularity, allowing users to switch between .308 Winchester and standard AR-15 (5.56 NATO) upper receivers. It features a proprietary lower receiver with a magazine well cut for both .308 and AR-15 magazines, and utilizes a specialized buffer and bolt carrier group for .308 operation.

Chapters

  1. 00:05Introduction to Olympic Arms MPR 308-AR
  2. 00:50Unique Features of the MPR 308-AR
  3. 01:51Barrel and Handguard Details
  4. 02:24Controls and Ergonomics
  5. 02:46Billet Lower Receiver and Convertible Design
  6. 03:32Disassembly and Bolt Carrier Group
  7. 04:52Detailed Look at the .308 Bolt
  8. 06:05Rifle Configuration for .308
  9. 06:30Conversion Process to 5.56 NATO
  10. 07:17Firing in 5.56 Configuration
  11. 07:45Returning to 7.62 Magazine
  12. 08:33Proprietary .308 Magazine Details
  13. 08:58Modularity and Caliber Options
  14. 10:41Range Test of the MPR 308-AR
  15. 12:22Comparison to Colt LE 901
  16. 13:45Conversion Process from .308 to 5.56 (Revisited)
  17. 14:41Firing in 5.56 Configuration (Revisited)
  18. 15:18Conclusion and Viewer Engagement

Frequently Asked Questions

What makes the Olympic Arms MPR 308-AR a unique rifle?

The Olympic Arms MPR 308-AR is unique due to its convertible design, allowing users to easily switch between a .308 Winchester upper receiver and standard milspec AR-15 upper receivers, offering significant modularity.

How does the Olympic Arms MPR 308-AR handle magazine compatibility?

The rifle features a proprietary lower receiver with a magazine well cut to accept both its proprietary single-column .308 magazine and standard AR-15 magazines when using a 5.56 upper.

What are the key components for the .308 conversion on the MPR 308-AR?

The .308 configuration requires a proprietary .308 upper receiver, a proprietary magazine, and a specialized bolt carrier group and buffer system to accommodate the larger cartridge and BCG dimensions.

Can the Olympic Arms MPR 308-AR accept other calibers besides .308 and 5.56?

Yes, by using standard milspec AR-15 upper receivers, the MPR 308-AR can be configured for a wide array of calibers, including 6.5 Grendel, 7.62x39, .300 Blackout, and many others.

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