Colt SP1 Vs Colt AR15-A2

Published on May 28, 2015
Duration: 13:03

This review compares the Colt SP1 and AR15-A2 Sporter, focusing on accuracy differences attributed to their 1:12 and 1:7 twist rates, respectively. While both performed similarly with 55gr ammo at 100 yards, the A2's adjustable sights proved superior for longer ranges. The SP1's older twist rate surprisingly stabilized heavier match bullets.

Quick Summary

The Colt SP1 features a 1:12 twist rate, while the AR15-A2 Sporter has a faster 1:7 twist. At 100 yards with 55gr ammo, both performed similarly (2" vs 1.5" groups). The A2's adjustable sights excel at long range, and the SP1 surprisingly stabilized 69gr bullets.

Chapters

  1. 00:00Colt SP1 Introduction & Specs
  2. 01:10Colt AR15-A2 Sporter Overview
  3. 01:58Test Ammo & Objectives
  4. 07:13A2 Sporter Historical Context
  5. 08:53Accuracy Comparison Results
  6. 11:13Long Range Performance & Conclusion

Frequently Asked Questions

What is the main difference in barrel twist rate between the Colt SP1 and AR15-A2 Sporter?

The Colt SP1 features an older 1:12 inch rifling twist rate, designed for lighter bullets. In contrast, the Colt AR15-A2 Sporter has a faster 1:7 inch twist rate, better suited for stabilizing heavier bullets at higher velocities.

How did the Colt SP1 and AR15-A2 Sporter perform in accuracy tests with 55gr ammunition?

In 100-yard accuracy tests using Wolf Gold 55gr ammunition, both rifles performed similarly. The SP1 achieved its best group at 2 inches, while the AR15-A2 Sporter's best group was 1.5 inches, suggesting the twist rate difference had minimal impact.

Which rifle is better for long-range shooting based on the review?

The AR15-A2 Sporter is considered superior for long-range shooting primarily due to its adjustable A2 rear sights, which allow for more precise elevation and windage adjustments compared to the SP1's fixed sights.

Can the Colt SP1's 1:12 twist stabilize heavier bullets?

Surprisingly, the Colt SP1's 1:12 twist rate demonstrated the ability to stabilize 69gr match bullets without keyholing during the test, challenging the notion that this twist rate is exclusively for lighter projectiles.

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