AR15 5.7x28: using the CMMG 5.7 conversion kit with barrel and bolt carrier group

In this video, we introduce the CMMG 57 by 28 barrel and bolt conversion for the AR-15, which chambers the 5.7x28mm round. The bolt, barrel, and magazines are proprietary, designed specifically for this setup. The conversion kit allows the AR-15 to maintain its original components, including the lower receiver, trigger group, buffer system, and upper receiver, while only changing the barrel and bolt carrier. The low recoil and smooth functionality, allow it to be paired with different barrel lengths or a complete upper receiver. A suppressor is recommended due to the gun's loudness. After testing at 100 yards, we see a solid grouping and performance.

In this video, the presenter introduces the CMMG 57x28 barrel and bolt conversion for the AR-15, which allows you to chamber the AR-15 in the 5.7x28mm round. The conversion kit includes a proprietary bolt, barrel, and magazines, all specifically designed for the 5.7 round. The presenter demonstrates the low recoil of the setup, noting that it’s nearly nonexistent, and shows how the firearm functions smoothly with the same AR-15 lower receiver, trigger group, and buffer system, with the only changes being the barrel and bolt carrier.

The video also touches on the versatility of the system, as it’s available in different barrel lengths, and you can purchase either a complete upper or just the barrel and bolt setup. The setup is compatible with typical AR-15 accessories, including the upper receiver, handguard, and muzzle devices.

While testing the firearm, the presenter tries shooting at 100 yards to check the accuracy, though they mention some struggles with magazine length. Despite that, they manage to get a decent grouping, with the last three shots close together.

The presenter also briefly mentions the noise level of the gun, suggesting the need for a suppressor since the 5.7x28mm round is louder than expected. The video concludes with a positive note on the groupings, indicating a good performance from the conversion setup.

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