Why 5.7? || 5.7x28mm vs 5.56x45mm

Published on February 23, 2020
Duration: 9:31

This guide details how to leverage the 5.7x28mm cartridge for compact firearm builds, focusing on CMMG conversions for AR-15 platforms, NFA considerations for SBRs, barrel length efficiency, and suppressor compatibility. The VSO Gun Channel Host provides expert insights into optimizing this caliber for smaller, lighter firearms.

Quick Summary

The 5.7x28mm cartridge offers significant advantages for compact firearm builds, including lighter weight, smaller ammunition, and optimized performance in short barrels. It enables the use of smaller suppressors and results in less reciprocating mass and flash signature compared to 5.56x45mm, making it ideal for SBRs and compact AR conversions.

Chapters

  1. 00:00Introduction to 5.7x28mm
  2. 00:30CMMG 5.7 AR Conversion
  3. 00:475.7 vs .22 LR and 5.56
  4. 02:41NFA and SBR Advantages
  5. 03:42Barrel Length and Velocity
  6. 05:29Suppressor Compatibility
  7. 08:36Final Comparison and Summary

Frequently Asked Questions

What are the main advantages of the 5.7x28mm cartridge for compact firearm builds?

The 5.7x28mm cartridge excels in compact builds due to its lighter weight, smaller ammunition size, and optimized performance in short barrels. It also allows for the use of smaller suppressors and results in less reciprocating mass and flash signature compared to 5.56x45mm.

How does the 5.7x28mm compare to 5.56x45mm in terms of firearm weight and size?

Firearms chambered in 5.7x28mm, like the CMMG Banshee, can be significantly lighter (e.g., 4.83 lbs) and more compact due to shorter barrel options and lighter components compared to 5.56x45mm AR-15s (e.g., 6.31 lbs with a 10.3-inch barrel).

Can I use standard AR-15 lowers with 5.7x28mm uppers?

Yes, CMMG offers 5.7 magazines that allow standard AR-15 lowers to be used with 5.7x28mm uppers, providing an ergonomic alternative to platforms like the P90 and improving compatibility for those who prefer the AR platform.

What are the benefits of using 5.7x28mm in Short Barreled Rifles (SBRs)?

Using 5.7x28mm in SBRs allows for a highly compact firearm package while potentially navigating NFA regulations more efficiently than with 5.56x45mm. The cartridge's performance in short barrels is a key advantage.

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