Arsenal SLR-104UR Test

Published on November 24, 2014
Duration: 16:38

This review of the Arsenal SLR-104UR SBR, presented by a high-authority firearms reviewer, details a test of its 1:8 twist rate's ability to stabilize 5.45x39mm ammunition in its short barrel. The test involved firing various commercial loads and monitoring impacts with a TargetCam system. The reviewer found no significant keyholing, indicating the twist rate was sufficient for the tested rounds.

Quick Summary

The Arsenal SLR-104UR SBR features an 8.5-inch barrel with a 1:8 twist rate, which was found to adequately stabilize various 5.45x39mm rounds without significant keyholing during testing. This twist rate, while standard for a 16" AK-74, proved effective on the shorter barrel. Proper barrel crowning is essential when modifying barrel lengths to maintain bullet stability.

Chapters

  1. 00:00Introduction & Krinkov Build
  2. 01:48Arsenal SLR-104UR Overview & Twist Rate
  3. 03:10Ammunition Testing Setup
  4. 11:11Stabilization Results & Keyholing Analysis
  5. 13:52TargetCam System Review
  6. 14:50Conclusion & Barrel Modification Advice

Frequently Asked Questions

What is the twist rate of the Arsenal SLR-104UR and does it stabilize 5.45x39mm rounds?

The Arsenal SLR-104UR features an 8.5-inch barrel with a 1:7.87" (1:8) twist rate. Testing with various 5.45x39mm loads showed no significant keyholing, indicating this twist rate is sufficient for stabilizing common rounds in its short barrel.

What causes keyholing in firearms, and how does it relate to barrel twist rate?

Keyholing occurs when a bullet fails to stabilize and strikes a target sideways. It's often caused by an improper barrel twist rate for the bullet's weight and velocity, or a damaged barrel crown. A faster twist rate (lower number) is generally needed for shorter barrels or heavier bullets.

What is the TargetCam system used in the Arsenal SLR-104UR test?

The TargetCam is a wireless camera system providing a real-time, 30fps video feed of the target. It supports multiple cameras and includes a waterproof Pelican case receiver with a built-in monitor, useful for observing bullet impacts at a distance.

What advice is given for modifying AK barrels?

If you plan to chop a 16-inch AK-74 barrel to a shorter length, it's crucial to ensure a proper crown is applied to the muzzle. This step is vital for maintaining bullet stabilization and preventing keyholing issues.

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