LR-308 Goes Fast

Published on June 19, 2023
Duration: 14:31

This video details the performance of a 3D-printed LR-308 build featuring a 'Super Safety' upgrade, which experienced malfunctions due to .308 bolt carrier group geometry. It also covers the testing of a 3D-printed 'Orca' rifle in 5.56mm, which faced short-stroking issues and a cracked handguard attributed to printing material and technique.

Quick Summary

The 'Super Safety' upgrade failed on the .308 LR-308 due to interference from the .308 bolt carrier group geometry. The Orca rifle's handguard cracked because of poor layer adhesion from printing wet nylon filament in an open-air environment.

Chapters

  1. 00:00Intro: 3D Printed LR-308 Build
  2. 01:53LR-308 Range Testing & Malfunctions
  3. 04:28Testing the 5.56mm Orca Rifle
  4. 10:21Failure Analysis: Orca & Handguard Crack

Frequently Asked Questions

Why did the 'Super Safety' upgrade fail on the 3D-printed LR-308?

The 'Super Safety' upgrade, designed for AR-15s, experienced malfunctions on the .308 LR-308 build. This was due to interference and excessive stress caused by the .308's specific bolt carrier group geometry, which differs from the AR-15's.

What caused the handguard on the 3D-printed Orca rifle to crack?

The handguard crack on the Orca rifle was attributed to poor layer adhesion. This likely resulted from printing the carbon fiber nylon filament (PA6-CF) while it was slightly wet and using an open-air printer, compromising its structural integrity.

What technical issues did the 5.56mm Orca rifle encounter during testing?

The 3D-printed Orca rifle experienced short-stroking issues, indicating a failure to cycle properly. The presenter suggested this was likely due to an under-gassed adjustable gas block, meaning not enough gas was being directed to operate the action.

What are the key components of the 3D-printed LR-308 build shown?

The 3D-printed LR-308 build featured a 3D-printed lower receiver, an Aero Precision upper, a Trijicon MRO optic, a Barrett charging handle, a Magpul bipod, and a 50-round drum magazine, chambered in 7.62x51mm (.308 Winchester).

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