Masterpiece Arms MPA-971: Frankengun of the Assault Weapons Ban

Published on May 15, 2026
Duration: 16:57

This video provides an in-depth review and technical breakdown of the MasterPiece Arms MPA 971, a unique 9mm semi-automatic carbine developed in the early 2000s. Host Ian McCollum details its construction, which incorporates elements from various firearms like the FAL and surplus Suomi submachine guns, specifically designed to navigate the 1994 Assault Weapons Ban. The review covers its disassembly, operational mechanics, and shooting impressions, highlighting its heavy weight, awkward ergonomics, and the significant gas blowback experienced during firing.

Quick Summary

The MasterPiece Arms MPA 971 is a 9mm semi-automatic carbine from the early 2000s, notable for its hybrid construction using surplus Suomi 71-round drum magazines and FN/FAL components. It was designed to navigate the 1994 Assault Weapons Ban's magazine restrictions. While reliable, it is criticized for its heavy weight, awkward ergonomics, and significant gas blowback.

Chapters

  1. 00:04Introduction to MPA 971
  2. 00:13MasterPiece Arms and Model 971 Designation
  3. 00:23Caliber and Magazine Capacity
  4. 00:31Design Philosophy: Suomi Drum Magazines
  5. 00:39MasterPiece Arms Company History
  6. 01:20Expansion and Development of the MPA 971
  7. 01:37Hybrid Construction Elements
  8. 02:00The Role of the Magazine
  9. 02:04Assault Weapons Ban Context (1994-2004)
  10. 02:20Magazine Grandfathering Clause
  11. 02:40Sunset Clause and Expected Renewal
  12. 03:08Circumventing the Ban
  13. 03:20Sourcing High-Capacity Magazines
  14. 04:04Suomi Drums as the Chosen Magazine
  15. 04:20Challenges of Adapting Suomi Drums
  16. 04:35MasterPiece Arms' Solution
  17. 04:50Utilizing FAL Components
  18. 05:22Design: Simple Blowback 9mm Carbine
  19. 05:36MPA 971 Overview
  20. 05:42Barrel Length and Non-NFA Status
  21. 06:02No Pistol Version, Arm Brace Context
  22. 06:10FAL Grip and Stock Compatibility
  23. 06:19DSA Parts and M249 SAW Stock
  24. 06:30Weight and Ergonomics
  25. 06:44Optic Addition (Red Dot)
  26. 07:01Magazine Release Mechanism
  27. 07:06Quad Stack Suomi Magazines
  28. 07:15New Manufactured Receiver Markings
  29. 07:27Serial Number and Production Volume
  30. 07:39Reasons for Limited Production
  31. 07:57FAL Controls (Safety/Fire)
  32. 08:02Selector Stop Screw
  33. 08:09Semi-Auto Only Fire Control Group
  34. 08:20Offset Rear Sight Issue
  35. 08:35Reason for Offset: Unmodified FAL Hammer
  36. 08:54Absence of Front Sights
  37. 09:10Picatinny Rail for Optics
  38. 09:18Disassembly: Buttstock Assembly
  39. 09:32Two-Part Pin Mechanism
  40. 10:00Removing Fire Control Assembly
  41. 10:10Removing Barrel Assembly
  42. 10:27Removing Receiver from Barrel
  43. 10:30Bolt Assembly Removal
  44. 10:36Bolt Design Comparison (MAC M11)
  45. 10:58Recoil Spring and Ejector
  46. 11:19Hammer Impact and Wear Marks
  47. 11:28FAL Hammer Interaction with Firing Pin
  48. 11:40Ejector Interference and Offset Requirement
  49. 12:20Receiver Construction
  50. 12:26Magazine Well Requirement
  51. 12:36Barrel Extension Design
  52. 12:50Side Charging Handle
  53. 13:12Handguard Removal
  54. 13:33Vertical Front Grip Addition
  55. 13:49Barrel Profile and Cooling
  56. 14:10Stylistic Ribbing on Barrel
  57. 14:20Fully Disassembled MPA 971
  58. 14:23Reputation: Heavy, Awkward, Reliable
  59. 14:46Lack of Innovation in Design
  60. 14:57Reassembly and Range Test Preview
  61. 15:02Range Test: Firing Impressions
  62. 15:25Gas Blowback Issues
  63. 15:55Overall Shooting Experience
  64. 16:08Reasons for Limited Production
  65. 16:15Rarity and Vibes vs. Quality
  66. 16:25Thanks to the Lender
  67. 16:36Conclusion

Frequently Asked Questions

What is the MasterPiece Arms MPA 971?

The MasterPiece Arms MPA 971 is a 9mm semi-automatic carbine produced in the early 2000s. It's a hybrid firearm designed to utilize surplus Suomi 71-round drum magazines and incorporates parts from the FN/FAL rifle, aiming to comply with the 1994 Assault Weapons Ban.

Why was the MPA 971 designed with specific components like the FAL lower and Suomi drums?

The MPA 971 was designed to circumvent the 1994 Assault Weapons Ban, which restricted new high-capacity magazines. By using grandfathered surplus Suomi drums and existing FAL components, MasterPiece Arms created a firearm that met the ban's technicalities while offering a high magazine capacity.

What are the main drawbacks of the MPA 971?

The MPA 971 is known for being very heavy, weighing over 10 lbs unloaded, and having awkward ergonomics. It also experiences significant gas blowback, making it unpleasant to shoot, especially left-handed. Its design is considered a repackaging of existing elements rather than innovative.

How does the MPA 971's design accommodate the FAL fire control group?

Using an unmodified FAL fire control group, particularly the hammer, required an offset in the MPA 971's receiver and barrel extension. This offset was necessary to prevent the hammer from interfering with the ejector rod, which is integrated into the bolt's guide rod.

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