KKM Precision Match M&P Conversion 357 Sig Barrel | Needs A Break In

Published on October 1, 2024
Duration: 12:04

This video reviews the KKM Precision Match M&P Conversion Barrel in 357 Sig. The reviewer highlights its drop-in nature and initial accuracy, noting a slight break-in period characterized by a sticky slide. Performance with both factory and handloaded ammunition is tested at various distances, with positive impressions of the barrel's potential once fully broken in.

Quick Summary

The KKM Precision M&P Conversion Barrel in 357 Sig is a drop-in upgrade for M&P pistols, requiring a break-in period for optimal performance. Initial tests show good accuracy, with a slight 'sticky' slide resolving over time. It's recommended for shooters seeking to convert their M&P to .357 SIG and improve accuracy.

Chapters

  1. 00:50Introducing the KKM Precision M&P Barrel
  2. 01:30Drop-in Installation Test
  3. 02:03Initial Break-in Observations (Sticky Slide)
  4. 02:26Accuracy Test: Offhand Grouping
  5. 03:21Ammunition Philosophy: Practicing with Stout Loads
  6. 04:14Feeding Test: HST vs. Underwood
  7. 05:13Post-Magazine Break-in Update
  8. 06:1980 Yard Gong Shooting
  9. 07:16Adjusting for Accuracy at Distance
  10. 08:36Final Break-in Check
  11. 09:46Chronograph Data: Factory vs. Handloads
  12. 10:35Break-in Progress and Conclusion

Frequently Asked Questions

What is the KKM Precision M&P Conversion Barrel?

The KKM Precision M&P Conversion Barrel is a match-grade barrel designed to convert Smith & Wesson M&P pistols from .40 S&W to fire .357 SIG ammunition. It's noted for its drop-in installation and potential for improved accuracy.

Does the KKM Precision barrel require a break-in period?

Yes, like many match-grade barrels, the KKM Precision M&P barrel typically requires a break-in period. The reviewer observed a 'sticky' slide initially, which is common and expected to resolve with use, leading to smoother operation and better accuracy.

How accurate is the KKM Precision M&P 357 Sig barrel?

The KKM Precision barrel demonstrated good accuracy offhand during its initial testing. While the reviewer noted limitations with the stock M&P trigger, the barrel produced acceptable groups and showed promise for further accuracy gains once fully broken in.

What ammunition was tested with the KKM Precision barrel?

The review tested both factory Federal HST ammunition and the reviewer's own stoutly loaded 125-grain handloads. Chronograph data was collected to compare velocities, with the handloads achieving slightly higher speeds.

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