223 Rem. / 5.56

Selecting the correct ammo for your AR-15 firearm. Why does it matter? 

• Twist Rate Matters:

  The rifling inside an AR-15 barrel, known as the twist rate, dictates how quickly the barrel spins the bullet. A faster twist rate (like 1:7) is better for heavier, longer bullets, while a slower twist rate (like 1:9) is better for lighter bullets. 
• 1:9 Twist Rate:

  A 1:9 twist rate is a common twist rate for AR-15 barrels and is suitable for 55-grain to 62-grain bullets. 
• 1:7 Twist Rate:

  A 1:7 twist rate is designed to stabilize heavier bullets, such as 75-77 grain bullets, and can also handle 62 grain bullets. 
• 1:12 Twist Rate:

  Older AR-15 barrels with a 1:12 twist rate are best suited for lighter bullets, such as 55-grain. 
• Choosing the Right Twist Rate:

  If you plan on shooting a variety of bullet weights, a 1:7 twist rate is a good choice because it can handle both lighter and heavier bullets. 
• Don’t Over-Spin:

  While a 1:7 twist rate can stabilize lighter bullets, it might over-spin them, potentially leading to reduced accuracy. 
• Consider Your Needs:

  Consider what you plan to use your AR-15 for (target shooting, hunting, etc.) and choose the twist rate that best suits your needs.