What Is Twist Rate and Does It Matter?

You’re looking at an M4 carbine for sale, and you see the barrel has a 1:7 twist rate. What does that even mean? Will it affect your shooting experience at the range or competition, or is it just a stat that manufacturers like to highlight for some reason? It’s actually important! In fact, knowing your rifle barrel’s twist rate is essential to being more accurate and choosing the right ammo to help you get the most out of the rifle. What Is Twist Rate? Twist rate refers to how fast the bullet twists as it travels down the barrel. For example, a typical M4A1 has a 1:7 twist rate, which means the bullet twists a full rotation for every 7 inches it travels down the barrel. Other common twist rates on an AR platform rifle are 1:8 and 1:9, but up to 1:12 isn’t unheard of. The original M16 was 1:14, but this has fallen out of style due to changes in common ammo. While rifles and pistols have rifling in the barrel, shotguns typically don’t, as they don’t need to put spin on t...