LaRue AR Rifle Parts Kit Physical

Published on August 29, 2020
Duration: 59:24

This video provides a detailed physical inspection of a LaRue Tactical AR-15 parts kit. It highlights the high quality of most components, including the MBT-2S trigger and upper receiver group. However, critical issues were found with undersized threads on the buffer tube and castle nut, suggesting these parts should be replaced for a reliable build.

Quick Summary

The LaRue Tactical AR-15 parts kit features a high-quality MBT-2S trigger breaking at ~3 lbs and an excellent barrel bore. However, critical issues were identified with undersized threads on the buffer tube and castle nut, necessitating their replacement for a reliable build.

Chapters

  1. 00:00Kit Overview & Unboxing
  2. 01:03Lower Receiver Components & Trigger
  3. 02:28MBT-2S Trigger Pull Test
  4. 05:49Buffer Assembly & Spring Inspection
  5. 07:44Buffer Tube & Castle Nut Thread Gauging
  6. 11:19Upper Receiver Group Unpacking
  7. 13:13Barrel & Bore Inspection
  8. 16:08Bolt Carrier Group (BCG) Gauging
  9. 18:05Final Assessment & Recommendations

Frequently Asked Questions

What were the key findings from the physical inspection of the LaRue AR-15 parts kit?

The inspection revealed high-quality components like the MBT-2S trigger and upper receiver. However, critical issues were found with undersized threads on the buffer tube and castle nut, which are recommended for replacement.

What is the trigger pull weight for the LaRue MBT-2S trigger in this kit?

The LaRue MBT-2S trigger is a two-stage trigger. Testing showed the first stage pull weight at approximately 2 lbs, with a clean break occurring around 3 lbs total.

Were there any issues with the buffer tube and castle nut threads in the LaRue kit?

Yes, the buffer tube and castle nut threads failed Class 2 and Class 3 thread gauges, indicating they were undersized (Class 1). This is a significant concern for build integrity.

How was the barrel and bore quality assessed in the LaRue AR-15 kit?

Using a borescope, the barrel's bore, rifling, and crown were found to be excellent. The gas port was properly deburred, and muzzle thread concentricity was confirmed.

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