Ultimate Piston AR-15 Meltdown!

Published on March 11, 2016
Duration: 18:59

This LMT piston AR-15 upper underwent a full-auto meltdown test, firing 833 rounds before failure. Unlike a previous DI test where the barrel failed, this piston system's internal components, specifically the bolt carrier and gas system, seized due to extreme heat. While the barrel remained straight, the piston rod warped, and the bolt carrier mushroomed, indicating mechanical limits were reached.

Quick Summary

The LMT piston AR-15 upper failed after 833 rounds in a full-auto meltdown test. Unlike a DI failure, the piston system's barrel remained straight, but internal components like the bolt carrier mushroomed and the gas system seized due to extreme heat exceeding 1000°F.

Chapters

  1. 00:00Intro: Piston vs DI Meltdown
  2. 01:11LMT Piston Upper Specs
  3. 02:03Test Setup & Safety Gear
  4. 03:04Full Auto Firing & Heat Monitoring
  5. 08:26Rifle Failure & Initial Assessment
  6. 11:09Post-Meltdown Component Analysis
  7. 13:18Final Results & Conclusions

Frequently Asked Questions

How many rounds did the LMT piston AR-15 upper fire before failing in the meltdown test?

The LMT CQB MRP 16-inch piston upper fired a total of 833 rounds before the gas system seized and the rifle stopped cycling during the full-auto meltdown test.

What was the primary failure point of the LMT piston AR-15 during the meltdown test?

The primary failure was the seizure of the gas system and internal component damage, including a mushroomed bolt carrier and warped piston rod, due to extreme heat.

How did the LMT piston AR-15 failure compare to the previous DI AR-15 test?

While both failed around the same round count, the DI AR-15 failed due to barrel drooping, whereas the LMT piston AR-15 experienced internal component failure and gas system seizure.

What temperatures were reached during the LMT piston AR-15 meltdown test?

Temperatures quickly exceeded 700°F and eventually surpassed 1000°F at the gas block area of the LMT piston AR-15 during the continuous full-auto firing sequence.

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