Inside the SOLGW 11.5” MK1 CAR: Build Quality and Performance

Published on January 1, 2026
Duration: 20:55

This expert review from Preston Moore details the Sons of Liberty Gun Works (SOLGW) 11.5” MK1 CAR AR-15 upper receiver. It features a comprehensive technical breakdown, including precise measurements of barrel dimensions, gas port, and BCG tolerances, alongside rigorous 30-shot group accuracy testing with various ammunition types. The analysis highlights the barrel's performance, particularly its consistency with PMC 62gr M855 and its potential for sub-MOA accuracy with specific loads, as evaluated by an instructor with high authority and data-driven methodology.

Quick Summary

The SOLGW 11.5” MK1 CAR upper receiver features a 41v50 steel, chrome-lined barrel with P3 polygonal rifling (1:7 twist) and a 0.068" gas port. It achieved 1.399 MOA with Federal 77gr SMK in 30-shot groups and showed excellent velocity consistency (15 fps SD) with PMC 62gr M855.

Chapters

  1. 00:00Introduction and Overview
  2. 00:25Technical Specifications
  3. 02:03Internal Barrel Inspection
  4. 03:17External Dimensions and Fitment
  5. 04:36BCG Gauging
  6. 05:23Borescope Inspection
  7. 06:52Range Testing Methodology
  8. 08:34Ammunition Test: Federal 77gr SMK
  9. 12:44Ammunition Test: PMC 62gr M855
  10. 15:03Ammunition Test: Hornady 73gr ELD Match
  11. 16:57Bonus Test: Repeated Chambering
  12. 20:12Conclusion and Barrel Options

Frequently Asked Questions

What are the key technical specifications of the SOLGW 11.5” MK1 CAR upper receiver?

The SOLGW 11.5” MK1 CAR features a 41v50 steel, chrome-lined barrel with P3 polygonal rifling (1:7 twist), a carbine-length gas system (0.068" port), an MP3-coated BCG, and a 10.75" DriveLock handguard. It is chambered in 5.56 NATO.

How did the SOLGW 11.5” MK1 CAR perform in accuracy testing?

In 30-shot groups at 100 yards, it achieved 1.399 MOA with Federal 77gr SMK and 1.725 MOA with Hornady 73gr ELD Match. A bonus test with manually cycled rounds yielded 1.053 MOA, indicating sub-MOA potential.

What was the velocity consistency of the SOLGW 11.5” MK1 CAR with PMC 62gr M855?

The SOLGW 11.5” MK1 CAR demonstrated exceptional velocity consistency with PMC 62gr M855 ammunition, recording a standard deviation of only 15 fps over a 30-shot group, placing it at the top of the leaderboard for this load.

What unique features does the SOLGW 11.5” MK1 CAR upper receiver possess?

It includes a relocated forward assist for charging handle clearance, a P3 polygonal rifling system for enhanced barrel life and forgiveness, and an interference fit between the barrel extension and upper receiver for maximum stability.

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