HK VP70 - Turning 9x19 into 9x17 since 1970

Published on February 15, 2021
Duration: 14:48

This video provides an in-depth analysis of the Heckler & Koch VP70, the first polymer-framed handgun. The speaker, a firearms historian, details its design origins, unique direct blowback action, and the intentional deep rifling that reduces muzzle velocity. Comparisons are made to modern handguns, highlighting the VP70's historical significance despite its performance limitations.

Quick Summary

The HK VP70, the first polymer-framed handgun from 1970, uses a direct blowback action and unique deep rifling. This design intentionally bleeds gas, reducing 9x19mm muzzle velocity to 9x17mm levels and resulting in a heavy DAO trigger, making it historically significant but ballistically limited compared to modern firearms.

Chapters

  1. 00:00Introduction to the HK VP70
  2. 00:45Volkspistole Concept and Design
  3. 02:04Unique Barrel Rifling
  4. 03:03Field Stripping and Features
  5. 07:01Velocity Testing vs. Hudson H9
  6. 10:59Velocity Testing vs. Sig P365 XL
  7. 12:46Summary and Conclusion

Frequently Asked Questions

What makes the HK VP70 unique among early polymer handguns?

The HK VP70, released in 1970, holds the distinction of being the first handgun to feature a polymer frame, predating other well-known polymer pistols. It also employs a direct blowback action and unique deep rifling.

How does the HK VP70's rifling affect its performance with 9x19mm ammunition?

The VP70 features intentionally deep rifling grooves. This design allows gas to bleed past the projectile, reducing chamber pressure but significantly lowering muzzle velocity, effectively turning 9x19mm performance into 9x17mm levels.

What is the action type of the HK VP70 and what are its implications?

The HK VP70 operates on a direct blowback system. This requires a heavy slide and strong recoil spring and results in a Double Action Only (DAO) trigger with a heavy pull, and inherently limits the velocity achievable with standard 9x19mm cartridges.

How does the HK VP70 compare in velocity to modern handguns?

Chronograph testing shows the HK VP70 consistently produces lower muzzle velocities than modern handguns like the Hudson H9 or even a compact Sig P365 XL, despite the latter having a shorter barrel. This is attributed to its gas-bleed rifling design.

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