Don't know about AR's, but I've measured in Kimber, Tikka, Remington and Ruger. If factory ammo is crimped in the cannelure, things will be interesting. There's a good chance the bullet will be jammed in the lands....referring to bolt guns.

I don't buy factory and honestly don't know if its being produced with this bullet.

I enjoy handguns and I really like shotguns,...but I love rifles!