This thing RIPS! Lima Six & Super Safety

Published on September 3, 2025
Duration: 0:57

This guide details troubleshooting and tuning a Lima Six belt-fed upper receiver, specifically addressing bolt bounce issues that lead to light primer strikes. The expert instruction from Military Arms Channel emphasizes using a heavier recoil spring and buffer to correct these malfunctions, ensuring reliable ignition with higher-pressure ammunition like M193 Ball. The process culminates in live-fire testing to confirm cyclic reliability and proper belt feeding.

Quick Summary

Troubleshooting light primer strikes on a Lima Six belt-fed upper involves addressing bolt bounce. Experts recommend installing a heavier recoil spring and buffer to slow the bolt carrier group, ensuring reliable primer ignition, especially when using higher-pressure M193 Ball ammunition.

Chapters

  1. 00:00Introduction & Bolt Bounce Issues
  2. 00:21Loading M193 Ball Ammunition
  3. 00:31Live Fire Demonstration & Tuning Success

Frequently Asked Questions

How do you fix light primer strikes on a Lima Six belt-fed upper?

Light primer strikes on a Lima Six belt-fed upper are often caused by bolt bounce. The solution involves installing a heavier recoil spring and a corresponding heavier buffer to slow the bolt carrier group's rearward travel, ensuring sufficient force for reliable primer ignition.

What ammunition was used to test the tuned Lima Six belt-fed upper?

The tuned Lima Six belt-fed upper was tested using M193 Ball ammunition. This type of ammunition typically has higher pressure than standard .223 Remington, making it a good test case for verifying the effectiveness of the tuning modifications.

What is bolt bounce and why is it a problem for belt-fed uppers?

Bolt bounce occurs when the bolt carrier group rebounds after cycling, potentially causing short-stroking or light primer strikes. For belt-fed uppers like the Lima Six, this can lead to feeding failures and misfires, necessitating tuning with heavier springs and buffers.

What components are adjusted to tune a Lima Six belt-fed upper for reliability?

To tune a Lima Six belt-fed upper for reliability and prevent bolt bounce, adjustments typically involve replacing the standard recoil spring with a heavier one and using a heavier buffer. This slows the bolt carrier group's cycle rate.

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