IT SLAPS! Midwest Industries Refresh Of The Griffin MK2

Published on October 30, 2025
Duration: 12:17

This video details the process of fixing an overgassed Griffin Armament AR-15 rifle by modifying the gas system and upgrading key components. The presenter, with extensive military and law enforcement experience, explains the issues of overgassing, including cycling problems and bolt bounce. The solution involves installing a new gas block with a corrected port size and upgrading to a Midwest Industries Combat HD rail and Mark 2 QD optic mount for improved stability and modularity. The video also covers essential gunsmithing techniques like deburring feed ramps and polishing the chamber for enhanced reliability and accuracy.

Quick Summary

The overgassing issue on the Griffin Armament rifle was resolved by installing a Yankee Hill Machine restricted gas block with a 0.075-inch port and polishing the feed ramps and chamber. This, combined with a Midwest Industries Combat HD rail and Mark 2 QD optic mount, significantly improved the rifle's reliability and handling.

Frequently Asked Questions

What were the main problems with the original Griffin Armament rifle?

The Griffin Armament rifle suffered from significant overgassing, leading to cycling issues like stove pipes and aggressive ejection. The bolt also traveled too violently, sometimes failing to pick up the next round because it moved faster than the magazine follower.

How was the overgassing issue on the AR-15 rifle fixed?

The overgassing was addressed by replacing the original gas block with a Yankee Hill Machine restricted gas block and drilling the port to 0.075 inches. Additionally, the feed ramps and chamber bore were deburred and polished for smoother operation.

What are the key features of the Midwest Industries Combat HD rail?

The Combat HD rail offers MLOCK at seven positions, MLOCK in three main positions, a full-length picatinny top rail with wire management relief, and integrated steel QD sling points. It also features anti-rotation tabs for stability.

Why is the Midwest Industries Mark 2 QD optic mount considered future-proof?

The Mark 2 QD mount is future-proof because it allows for interchangeable top rings, enabling users to mount accessories like rangefinders or red dot optics. It also uses robust T-25 fasteners for durability and quick detach capability.

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